What do you do while you're waiting for your tests to run?

Tests and test suites can take any amount of time to run. When I'm running one that takes between, say, 30 seconds and 5 minutes to run, I'm never sure what I should do during that time.

It's too long a time to just sit there. It's too short a time to actually do anything else. Plus, if I try to go and do anything else, I forget about the test. I forget which is supposed to be the "background job" and the "foreground job", and I end up accomplishing very little overall.

So, what do you do while your 30-second to five-minute tests are running?

Note: I'm not looking for advice, I'm looking for the best solution someone has come up with that that person actually practices.