Dangling modifiers.
Carrying a futon frame up a set of stairs with an iron railing.
Answering the phone when the caller thinks one knows who he is by recognizing his voice, but one does not. This is awkward in the extreme.
Dining with people who assume everyone holds hands and says grace before eating.
(See: The Pillow Book)
sbd farting in an elevator with one other person in it.
when a friend helping you pack in preparation for moving finds the porn stash.
that “to catch a predator” series on dateline.
when you wanted to just leave a message but the person you’re calling picks up unexpectedly.
running into an ex with your new boyfriend.