Due to entertaining his boyfriend, Calvin was largely absent for today's house pranks (which included a lot of locking people out of rooms and attacking them with water guns).
I did, however, swap the contents of his cupboard around so that everything on the left was on the right and vice versa. My housemates claimed that "He probably won't even notice". When Calvin went into the kitchen, we heard him shout "IT'S BEEN MIRRORED!" with a slight hint of terror in his voice.
Apparently the cupboard is laid out in an important way. For example, he can pick a bowl up with his left hand and some cereal with his right, allowing for an easy pouring experience. I essentially had destroyed Calvin's world.
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