This happened on a flight the other day:
Female Pax: Have you any sanitary napkins or tampons.
Me: Umm, no, I'm a boy (a cheeky attempt to hide my embarrassment).
Female Pax: (Laughing) I can see that, but you don't have them onboard.
Me: Errm, no, sorry.
10 mins later as I walk past.
Female Pax: Hey, you do have them. They're in the toilets, my husband saw them when he went!
Male Pax (Husband): (Crossly) You should know that lad.
Me: Well, I've never been into the girls toilets on the aircraft before, but what were you doing in there anyway? (Being cheeky again).
Male Pax: Oh shi!t, was that the girls? I didn't see the sign!
Me: Well, how embarassing, you won't do that again will ya? (winking at wife).
Female pax wet herself laughing!