He was stumped.
She couldn't solve inequalities.
Because they're all criminals and they look the same.
Lumberjack: Oh, you really don't know why? Tree: Sorry, I'm stumped.
A lumberjack.
Run, Forest, run!
Because he was drunk Why did the second monkey fall out of the tree? He was tied to the first one Why did the third monkey fall out of the tree? Peer Pressure
It was stumped.