What a failure! Your roommate ate your yummy treats again while you went to the store. Upon coming home, you immediately ran to the fridge, opened it in anticipation of eating yummy, but realized that it was not in its original place. They're gone! At this time, you heard someone giggling in the other room. you quickly ran to the room from which you could hear the giggling - it was your roommate Manjiro's room! you immediately opened the door and you saw Manjiro sitting on his bed eating your ice cream, and next to him a few more sweets that you bought. He noticed you and looked at you slyly.

What are you going to do?