Got counseled once for telling a sister (we were both about 19 at the time) that her dress looked nice.
Apparently that "made her feel uncomfortable". And here I thought women liked to be complimented on their appearance if they put forth the effort to look especially attractive on a particular day. Obviously not this one.
And of course, later I got talked to for holding my girlfriend's hand. We were both in our twenties and had been dating for months. We were just walking down the street holding hands and talking (not in field service or at a meeting) and an elder saw us. Got an earful about "innappropriate displays of affection for unmarried persons", yada, yada, yada...