Incredibly stupid question

[some_guy]

When I'm using brushes in PS, sometimes I'll accidentally hit a keyboard shortcut and I won't be able to see the outline of the brush anymore. The shortcut turns it into a crosshair and I can't tell what size my brush is. It's really annoying.

What am I pressing?!

[Silverwing]

You are pressing Caps lock! It happens to me a lot too, it took me forever to figure out what I'd accidentally pushed!

[some_guy]

Aah. I knew it was on that side of the keyboard, but that's about it. Thank you so much!