5 floors up so out the window seems cruel... not going to get dressed and wander down the stairs (some unsavoury types camped out in the stairwells at night). I blame sleep deprivation (or perhaps depravity) for what I did next. I drowned the mouse. He swam for about 5 seconds and then just died.
although my own murderous past has been mentioned above, I'm inclined to think you a sadist.