Well, I can't say anything like that has ever happened to me :-( My only Hump-Day experience was a couple of years' back. I turned up at work about 7:30 and greeted Sarah who sat near me. Sarah is a sweetly pretty and demure young lady. The conversation was roughly as follows:
Andrew: Morning
Sarah: Morning. (smiles and announces) It's Hump Day today!
Andrew: (thinking he heard it wrong) Eh?
Sarah: Hump Day!
Andrew: (sleep-deprived brain desperately struggling, thinks "I know she doesn't mean that, she can't mean that, but I have no idea what she does mean. Help!") Oh?
Sarah: You know? Hump Day!
Andrew looks confused.
Sarah proceeds to explain.
Andrew stops looking confused.