I have a pet peeve. I have a pet peeve. I have a pet peeve. Bangs Bangs Bangs!

Anyway what's up with this sudden craze for word games and puzzles? I swear I've heard the same one way too many times.

Just a snip, and the whole world has a different beat.
A stright line that doesn't look very fine.
A horizontal scar that looks like a bar.
Brings out the dirt so cover it with your shirt.