What would you think/do when you find your roommate/partner is sharpening a knife?

Well, to be honest, you’re sleeping but upon hearing some weird sound you’re awaken from your slumber and suddenly find him/her sharpening a knife in your bedroom in the middle of the night. He/she has such a blast sharpening the knife and you can’t help but notice that he/she has psychotic eyes and evil grin throughout the session. It seems that the knife is never sharp enough for him/her.

What would you do? Feel free to be as realistic or as funny as you want.