8 = Legs on a Squid (normally comes up as legs on an octopus, I think it's also true for squids)
13 = Stripes on the American Flag
40 = Thieves of Ali Baba
15 = First Point in Tennis
Who do you think (s)he's talking to??? You've probably posted the whole quiz now - all old chestnuts, easily searchable on this or other sites. No offence, but that's why you're annoying people.