Interesting gambling paradox I learned of some time ago.
A guy offers the following. He flips a coin as many times as required until he first flips a tail. If he flips T on first try you get $2. HT he pays you $4. HHT, $8; HHHT, $16; HHHHT $32, etc.
How much should you be willing to pay to play this game?
Answer - the EV of this game is infinite, as you have 1/2 chance at $2 payout, 1/4 chance of $4 payout, etc. and each of these pieces is worth $1 of EV, so if you add them all up you get 1 + 1 + 1 + ... Thus, you could argue that you should be willing to pay any amount to play this game. It's a paradox because you can easily see that you probably wouldn't wanna pay $1M to play a round, not to mention that it's impossible to have arbitrarily high payouts (there is a practical limit to how much money you can actually win - all the money in the world is the limit, and even that isn't really worth the nominal value if you were to actually hold it all.
Since waking today, I've had the song from Star is Born ("tell me something, boy...") stuck on my head on loop. Hoping sending this note will break the curse