Player is really erratic - he's playing 100% of hands, mixing it up between limping and raising, but mostly limping. He never folds to a raise pre, and donk bets most flops a lot of the time mashing the pot button.
We have

in the SB, 16665 chips.
Blinds 100/200.
Folds to maniac (10k) in the cut off, who limps.
Button Limps (9k).
We raise to 800, bb folds, Maniac does a weird click back to 1.2k, button calls.
The pot is 3.8k. Maniac has 8.7k behind, button has 8k behind.
We jam.