"Oh, yeah," you exclaim with all of the enthusiasm and authenticity you can muster, "Bruno Mars is great, I totally love them. Their music is amazing."
Your coworker is visibly displeased by your obvious lie, and perhaps over-reacts a little. Due to the unpredictibility of human nature and dreams, she actually goes above and beyond the normal route of letting you know that you're sort of a jerk. Instead, she draws an Uzi and perforates you.