Finding someone else's pubic hair as I unfold a "clean" hotel towel.
After a very tasty cup of hot joe at a diner, the person sitting in the facing bench tells you about the lipstick on your cup...sure enough, you turn it around and there it is...gross.
Any unidentified smell in the back of a taxi (that I didn't create).
Hilary Clinton.
Limp & slightly moist handshakes.
And much, much more...