You're in your dorm room, resting after a crazy day, at night... and you hear sounds coming from the kitchen. When you slowly wake up and check, and it's your roommate rummaging through the fridge for leftovers. He grabs your leftovers, not realizing you're just standing there, watching him rummaging through. When he does, he gets startled.

Ah! didn't see ya there!

Of course he didn't with those sharp triangular glasses. (icon made in picrew btw - the creator)