-->..ice-cream, you will see their weight drop as well.

so this means that too much ice cream will kill you?

-->..mostly with those other gasses

21g methan gas would be quite dangerous. Dont lit a match next to someone dead or you will be next
I wonder how they meassure this at all?
so whenever you hear a doctor say "just lay on this balance please and relax"... run forrest, run?!

there are a ton of very interesting books about those urban legends you can get. if you are interested in this trivia knowledge you should find some nice things in there.

and dont let anyone tell you this things are useless to know. you never know when you will be abducted by some aliens and brought to an intergalactic game show!

cheers