Ask Slashdot: What's On Your Keychain?

kuhnto writes: I was playing with my key chain and started to wonder: what does everyone on Slashdot have on their key chains? What cool things do you have that you want to share? I'll start: car key, car alarm dongle, house key, Kingston USB Drive, AAA micro flashlight, and a Swiss-tech Utili-key. To extend this a bit: what other things do you usually carry around with you, aside from the common items like phones, keyrings, and card/cash holders?