You know what's a really fun thing to do? If you have mascara on, you can scrape it off between your fingernail and your thumbnail. It comes off in clumps. It's really very satisfying.
Of course, sometimes it also rips your eyelashes out, so if you're going for the thick, full eyelashes look, I wouldn't recommend this, because the long-term results won't be what you're wanting. But for some of us, I guess the pleasure of the moment just wins out.