Here's a fun effect to create: grunge type. It's often used on movie posters (think slasher flicks). To create the effect, you need a very "busy" photo, something with lots of hard lines. By using the Threshold adjustment, we'll morph an ordinary photo into a properly distressed, grungy texture which we'll place on top of some type or whatever else you might want.
We won't just plop the texture *onto* the type, mind you, I'll show you how to copy it into a layer mask so you can do some fine-tuning and moving around, if you so desire. Read on!