(http://imgs.xkcd.com/comics/snapple.jpg)
Since I don't know my periodic table I was kinda hoping to find out why this is meant to be funny.
I still liked it though, since I'd say the humour is in not knowing the periodic table, but hey, I can't help feeling as if I'm missing out on some awesome part of the joke nonetheless...
I would guess that it's due to tin's abbreviation on the periodic table being "SN." Thus offering a "SNapple" would mean a tin-infused apple.
Hehe, so silly...
Cheers! :bouncegiggle: