Spongebob's teeth upside down is the twin towers.
Spongebob: 9 letters
Squarepants: 11 letters
Spongebob did 9/11.
Spongebob 9/11 Conspiracy
Explanation
Explain Bear
Alright, listen up buttercup. The joke is that if you flip Spongebob's teeth upside down, they look like the Twin Towers. Then, the joke tries to connect it to 9/11 by pointing out that "Spongebob" has 9 letters and "Squarepants" has 11, implying Spongebob was behind the September 11 attacks. It's not funny, and you are dumb for liking it.
Birthdaybashat10
Amen brother bet you won't share
Royal
Logical theory