It's Always Sunny in Philadelphia2005

Dennis Reynolds:
[while training Charlie to become an underground fighter] Why don't you punch this board?

[Dennis grabs a board and holds it up]

Charlie Kelly:
Okay. Hold it steady for me. Watch your eyes.

[Charlie punches the board and groans in pain]

Mac:
That looks like it stings.

Charlie Kelly:
Oh my god! What is that made out of?

Dennis Reynolds:
It's a board so it's, you know, made out of wood.

Mac:
It's like particle board.

Charlie Kelly:
It's like harder than wood, dude.

Mac:
It's actually softer than wood.