I had bought a really cheap acoustic on eBay (you can't get much cheaper than an Abe Linc in metal), and I used the pick that came with it, a really thin plasticy green pick that finally was cracking into bits. Playing an electric at this point, I decided to grab a pack of First Act picks from Wal-Mart after work. Not that I really liked them; they always felt so damn clumsy in my hands.
While standing in checkout, I looked down and saw this Dunlop Jazz III pick. Not that I actually knew it was a pick at the time -- it looked like the safety tab off of a spray can, and the only Dunlop I knew of then was in automotives. Curious, I kept it, took it home, then looked it up, since it looked like it would make for a great smaller pick -- Legend of Black Heaven had inspired such thinking with a yen coin. That's when I found out it WAS a pick.
Destined to play, I tell you. :D
First Acts tended to fray badly under my playing, and I've used a Fender Medium pick once. It does not like lots of strumming, I'm afraid, having virtually melted on me after seven minutes of jamming. I am curious about ceramic picks I saw in the back of Guitar World, but I still have and use that red Dunlop I found. And bought a few more just in case, too.