"Last BFDI" is a video created as a celebration for 20,000 subscribers. It shows a vertically scrolling animation of a Rube Goldberg machine containing all 31 contestants of BFDI and BFDIA combined (but no hosts), creating and destroying them over and over. The song in the video is based on "Last Step" by Dubmood who was a member of Razor1911.
Map of birthtree
|Contestant name||Commencement (start)||Termination (end)|
|Blocky||Pin's point is removed, resulting in Blocky.||Blocky is cut into three parts; one for Match, one for Fries's container, and one turns into Eraser.|
|Bomby||Match's ashes cover up Tennis Ball.||Bomby is ignited with a firebox, then explodes, resulting in Rocky.|
|Book||The paper that Pen writes on is closed into a book, which Pen's cap covers in blue and green.||Dora hops out of Book's illustration and eats her.|
|Bubble*||Excess water from Teardrop falls onto a platform, which is blown by a blow-dryer, creating Bubble.||David's crushed body is splattered onto her, giving her dimples and turning her into Golf Ball.|
|Coiny||Fries' fries fall on Nickel, turning him into Coiny.||Coiny notices Nickel and falls down a funnel to create Needle.|
|David||Dora's hair falls off, turning her into David.||His head is cut off and turns into Snowball, while his crushed body covers Bubble in dimples.|
|Donut||A hole is punched in Yellow Face.||Donut falls down a cutter to make Fries' fries.|
|Dora*||Book opens and Dora comes out of her article illustration.||Dora's hair falls off, turning her into David.|
|Eraser||Eraser comes from taking part of Blocky and pushing the top part back||Eraser collides with a piece of wood from Woody to make Pencil|
|Firey||Match is burned by a lighter to make Firey.||A bubble blower makes water flow down to extinguish him.|
|Flower||She is the first plant to come out of the flower pot when it is watered.||Her body gets cut off by a knife; her petals then fall off and get crushed, while her head flies in front of a hole puncher. The pink powder from her petals falls on Gelatin and creates Puffball, and her head turns into Yellow Face.|
|Fries||Fries' fries come from Donut, and the container comes from one of Blocky's parts.||
His fries turn Nickel into Coiny, and his container is crushed into nothing.
Note: Fries' fries and container are separate in both the commencement and the termination. They are temporarily put together in between.
|Gelatin*||The second plant to come out of the flower pot when it is watered is a green bush, which collides with Dora's hair to make Gelatin.||Flower's petals turn Gelatin into Puffball.|
|Golf Ball*||Dimples are splashed on Bubble, causing her to become Golf Ball.||
She, Leafy and Puffball are zapped, fusing into Tennis Ball.
|Ice Cube||Teardrop is pulled into a freezer and comes out as Ice Cube.||Ice Cube walks on a heating element and melts, watering the flower pot.|
|Leafy*||The second plant to come out of the flower pot when it is watered is a green bush. One of its leaves is cut off, making Leafy.||She, Golf Ball and Puffball are zapped, fusing into Tennis Ball.|
|Match||Part of Blocky on top of Woody gets crushed thinner, resulting in Match.||She gets set on fire by a lighter to create Firey.|
|Needle||Coiny falls down a funnel.||Needle is turned upside down and stuck into Ruby to make Pin.|
|Nickel*||Rocky's remains are compressed against the platform above him, resulting in Nickel.||Fries' fries turn him into Coiny.|
|Pen||A cap generator makes a cap, which falls on Pencil to make Pen.||He disappears when Book is being closed.|
|Pencil||Eraser and a piece of wood from Woody collide to make Pencil.||A blue cap falls on her to make Pen.|
|Pin||Needle is turned upside down and poked into Ruby.||Her point is removed, turning her into Blocky.|
|Puffball||Gelatin and Flower's petals collide, resulting in Puffball.||She, Golf Ball and Leafy are zapped, fusing into Tennis Ball.|
|Rocky||Rocky emerges from Bomby's explosion.||Rocky is mined with a pickaxe to reveal Ruby, and his remains are compressed to create Nickel.|
|Ruby*||She comes out of Rocky after he is mined.||Needle is turned upside down and stuck into her to make Pin.|
|Snowball||David's head turns into Snowball.||Snowball melts into Teardrop.|
|Spongy||None||Just sits there doing nothing|
|Teardrop||Snowball is melted to create her and Bubble.||Teardrop is pulled into a freezer to make Ice Cube.|
|Tennis Ball||Golf Ball, Leafy and Puffball are zapped, fusing to make Tennis Ball.||Match's ashes cover Tennis Ball up, making Bomby.|
|Woody||The second plant to come out of the flower pot when it is watered is a green bush. One of its branches is cut off to make Woody.||A piece falls off of Woody, making Pencil, and the rest of Woody forms Match.|
|Yellow Face||Flower loses her head and petals.||A hole is punched in him, making Donut.|
- *These contestants are visible for longer than cycle length before being terminated, thus you see two copies of them at certain times.
Semi-plausible transformations such as abrasion.
Transformations that involve combining two or more characters.
Fluid transformations that are completely implausible.
Heat based transformations.
Cold based transformations.
Nature/Growth based transformations.
- Flower's petalless head can be seen for the first time in this video.
- Pen can be seen without his cap on for the first time.
- Spongy is the only character who appears without being a part of the chain reaction. He sits to the right of where Ruby walks to before she becomes Pin.
- Book's page when Dora appears reads:
This is Dora. She is the worst person ever. She also eats islands. Dora is not related to David in any way. Her Spanish is terrible. Dora is horrible, sickening, infuriating, disgusting, and nauseating. This is an autobiography.