It's pretty unlikely to do you any harm at all, if it was a small piece.
unless it managed to get stuck somewhere. It only freeze burns you if you hold it one place for a fair time. The heat from your skin causes sublimation and traps a tiny layer of CO2 gas between your skin and and the solid CO2, which acts as an insulator, preventing instant damage. Same reason you can put your hand into liquid nitrogen and take it out again without damage.

It might make your stomach feel a little cold and you'd get pretty burpy, though.

I handle dry ice without gloves all the time, it's fine. Probably shouldn't, but there you go.

/this reply nominated as an entry for "dullest post this week"
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Aug 2012, 12:21, 2 replies)

No, that's interesting.
Same as well as that thing on mythbusters where they plunge their hands into molten lead. Provided the hand is wet, you can get away with it for half a second.

Makes sense. If you swallowed it, it would only be making contact with a wet surface, or be immersed in liquid. Plausible, and I bet foggy burps would look fucking cool.
(username failed moderation, Mon 13 Aug 2012, 12:26, closed)

having said that, a big lump would be an issue
because if it stopped at any point in your oesophagus you'd have a problem.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Aug 2012, 12:27, closed)

Which is my point.
We're dealing with variables in what constitutes a "big" or "small" piece here, particularly if there are small or petite people involved.
( Je suis un vagabond is an unfunny, up your own arse middle class knob, Mon 13 Aug 2012, 12:30, closed)

agreed
but it's a myth that it burns on contact with skin or flesh.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Aug 2012, 12:33, closed)

I don't even want to think about that.
Frostbite of the voicebox. Ouch.

We did actually crush the stuff, so none of it would have been any bigger than say a sugar cube. These issues were probably thought of at the time, we were reasonably sober at the start of the party . . .
(username failed moderation, Mon 13 Aug 2012, 12:32, closed)

I still can't imagine that suggesting swallowing dry ice is the best recipe for happy drunken sexy fun time, though.
Or, indeed, happy drunken fun time full stop.
( Je suis un vagabond is an unfunny, up your own arse middle class knob, Mon 13 Aug 2012, 12:29, closed)

well, no.
unless you've got a hot friend who's turned on by you burping fog.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Aug 2012, 12:32, closed)

You mean you don't?

( Je suis un vagabond is an unfunny, up your own arse middle class knob, Mon 13 Aug 2012, 12:51, closed)

not any more
she's now my wife.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 13 Aug 2012, 14:51, closed)

Getting married
never stopped my wife from burping.
(username failed moderation, Mon 13 Aug 2012, 15:09, closed)