Monkey staring at the ground

Monkey see, Monkey do :D

a monkey's head that looks a lot like homer simpson saying "now I wanna!". There's also a line, right down the middle.

Homer Simpson is high, with a chimp face coming from his neck.

bert from sesame street looking very very stoned, or so mad at that monkey that his eyes are bloodshot

Bert takes a break from his job at the sesame-street deli. He's smoking a joint while watching a monkey hang himself.

ernie from the muppet show hanging a monkey