Similar here, although I surprised him on his 50th. He thought the surprise was family coming to town. Which was part A. Part B was the party later. Even had it at our house; he figured the extra cleaning was for his family. Misdirection is the key.
Very true about hot is hot, but dry hot is much preferable to steamy hot. I live in the Phoenix area and I can avoid the heat by staying in, but you can’t avoid the humidity.
No, I think when it happens to me, it is telling me to back the heck away.