Get it off your chests, folks, there's no shame here - what have you done in the game that made you facepalm?
I have:
*had several community building underway at a time and taken weeks to get the materials
*bought the Mint and never used it once
*excitedly blown through my last 30 clovers for a House of Luck task I hadn't actually taken
*filled 8/9 high value plane crates and then let it time out just because I forgot it existed
*miscounted a few crop tasks I then inevitably failed (including a silk - ugh)
*sent ships to the wrong island at least twice
*used up my factory goods moments before taking the factory task, forgetting the shelves were now empty
ETA: *accidentally bought cow feed in between attempts to get Raja to offer me 15 picks
I'm certain there's more, but that's quite enough to feel like a plum. Anybody else care to share?