Interesting ethical dilemma.
Imagine you are around town, late on a Saturday night, with a group of mates on a piss up.
At 3am, you find yourself (naturally) in an all-night kebab shop.
Another drunken customer arrives, in a clearly more intoxicated state than you, and, without apparent provocation, drops his strides to his ankles. At this point, you realise he is actually a well known local professional sportsman.
Do you:
A. Urge him to pull his trousers up again, as he risks offending the kebab shop owner?
B. Enquire if he is in need of assistance?
C. Pull out your smart phone and begin to film his antics?
D. Ask for his autograph?
E. Quickly find another kebab shop?