Meh, I've swallowed loads of pennys and 2 pences in my time, among other things for the ammusement of others.
Worst one being a pint glass filled with:
Larger
Cider
Guiness
Caffrees
Few Pennies
Cigg ash
Cigg Butts
Looked VIAL.... but gained me around £50, had the whole pub around me watching. I'm bad for bets, once I'm bet to do something, I'll do it lol.
Oh.. on a subnote, I didn't notice anything coming out a few days later.. hoepfully it was just the fact I didn't notice, rather than the fact it didn't.....