Homophone jokes
Say "I cup" but in words.
Why is 6 afraid of 7? Because 7 ate 9.
Memes
16 is a knight? Mail.
What do you call a closet with two lesbians inside?
A liquor cabinet.
If O2 is H2O, what is F?
It is H2O too; F is water as well.
What's 2+2? FORE-head.