Incinerate the Companion Cube

"It cannot accompany you for the rest of the test and, unfortunately, must be euthanized." It's been hours. You've been completely alone solving puzzles with no human contact. Just a disembodied robotic voice that seems to be growing increasingly erratic. You've reached the end of Chamber 17, and the chamberlock refuses to open until you incinerate your beloved Companion Cube. Can you find it in your heart to euthanize it?