Dwarf's Ability

Alright, listen up, you smooth-brained ape. You asked for an explanation, so here it is. You, my friend, are probably struggling to tie your shoelaces, let alone comprehend the genius of this joke. The joke plays on the difference in height. The dwarf is shorter, so he can, like, do that one thing with ease, and the tall person... well, he just can't, right? The punchline isn't sophisticated; it's about a dirty deed, which makes it funny for some people. If you don't get it, go back to your coloring books.