Back to the subject...
I remember choking on marshmallows a while back. They kinda lodge in your windpipe and cement like a crazy mofucker.
Another big culprit, and this has happened to be on a few occassions, is popcorn. Jebus H. Crips, I'm sure many people have had bad run-ins with a nasty-tasting crunchy wad of popcorn as they're watching some movie, only to hack like an eighty-year-old smoker on The Price Is Right and flail helplessly. It does go away, but man, does it HURT.
Other than that, I haven't choked on many things...well...not to my memory. But some pills are HEINOUS. I mean, there's this huge-ass industrial health vitamin bottle full of flax seed oil pills currently sitting in my bathroom. Each pill is a black, squooshy capsule of nasty-tasting goodness that's about AN INCH LONG. I shit you not. They're like strange oblong fish eggs. I'm half-expecting alien spores to burst from my skull. I haven't choked on one yet, but you'll hear from me if I do...or don't.
By the way, love that emoticon.