i would make the same face as Ummal in your (Laxus_Dreyar's) pic/post, and just look at'em until they apologise, then throw it away, and find some kind of meat ta eat. >:S
Like Dray said- don't waste ice-cream, i'm likely to be ill anyway so what's another couple thousand germs?
However if it were my son eating the ice cream, i would stop him, run after the bloke who sneezed/coughed on it and politely say "here, you really wanted my sons' ice-cream after spreading your germs on it" hand it to him and then go buy my son another one.
"Nigga...you serious?"
*pulls out USAS-12 Automatic*
"Coughing in my shit I see. You know, 'cough' is synonymous with 'pull trigger'. I think I feel a cough coming. Or you could buy me more. Your pick."
Me: *twitches eye* Umm, *fake smiles* Watch out where you cough sir. *throws Ice Cream* (buys another one)
Guy: *sneezes on My Ice Cream*
Me: DAMN IT! *smashes Ice Cream on his face*