We've had this happen to us too, except the man who picked Mika up was-I can't think of a nicer way to put it-mentally disabled. I feared if I made a fuss he might freak out or something
So I reached out to take Mika and said with a smile "I better take her, she might pee on you" he giggled and handed her over! PHEW! You have to be sooo careful as you never know how people might react when they've got your baby in their arms.