The video starts with the same "Happy birthday, BFDI!" circling-around-the-cake animation used in Don't Lose Your Marbles and Get in the Van, but then Pen jumps out, stops the animation, and thanks the viewers for watching BFDI for 4 years and for all of the support. As Pen finishes his last line in the video, the Happy Birthday circle catches on fire and drops down onto Pen as the screen fades to black, showing a card that says "Thanks for 4 years". Snowball screaming can be heard as the video ends.
- Pen and Snowball are the only ones who speak in this video.
- Despite the fact that BFDIA was still airing when this video was made, only the original BFDI cast (with the exception of David and Announcer) appeared in the circle around the cake.
- This is the first video where the characters break the fourth wall, not counting the ending voting scene in all episodes, which is ironic as it was uploaded to celebrate BFDI's 4th birthday.
- This is the first video that features Pen with eyelashes and new mouth designs.
- At the end, Snowball says "Oh god my leg!".
- This is supposedly Match’s favorite video, as stated in "Thanks for 4 years of Thanks for 4 years!"
- This is the first video made to celebrate BFDI’s birthday, the second being “Thanks for 4 years of Thanks for 4 years!”, and the third being “Happy Birthday, Battle for BFDI!”