laugh it off and pull someones else's pants down and laugh অথবা yell out "Im so sexy I took my pants off for you!!!!" হাঃ হাঃ হাঃ hmmm my real answer would be to cry and run away হাঃ হাঃ হাঃ double time
Pull them up with a serious face on. :D then walk away অথবা keep doing what i was doing before they fell off, without looking panicked অথবা embarrased.
i heard about this women who was walking where there was huge crowds of people, and her underwear fell right off, onto the ground, then she just walked 'out of them' with aa serious face.