1/100 runs of MoF, I'll start flying in one direction, and if I un-fullscreen and then re-fullscreen UFO, there's input lag, even with the Vpatch, BUT...
PERFECT MOTHERFUCKING CHERRY BLOSSOM
If I pause it and then minimise or defullscreen the window then go to type to someone, there is a chance of the keys spamming and hitting everything at once and quitting my game.
Happened when I was on Yuyuko's final spell with 4/4 remaining. My first 'successful' Normal 1cc of PCB, too :T