Unexpectedly having to shake hands after a trip to the bathroom. You know they're wet because you've washed them, but the other person can't help suspecting that it's wee
the first little metal fella in a new set of of staples, destined to be cast into the void after the ker-chunk "let's staple-thin-air test" demonstrates that the machine still works after being refilled
The disconcerting way people alter their tone of voice when saying goodbye on a business call from their conversational norm to a inappropriately intimate, breathy, whispery bye...
Announcing your engagement to friends, only for another couple to subsequently announce theirs AND an actual wedding date - thus nabbing the nuptial limelight
the victorious feeling when an arriving tube comes to a standstill with its doors exactly where you are - giving you a clear run at the last available seat