MH: Running out of the switch room as the fire suppression system kicks on, only tripping and skidding on the tile you had just pulled up, and being unable to reach the disable trigger before the Halon system goes off. (And you wonder why I don't want to work in the back section of the server room?)
MH: Forgetting that the printer is plugged in when you go to work on it, accidentally touching the charging wires, cutting yourself on them and shorting a few thousand volts to ground, through your heart.
MH: Spraying "Ozone safe" compressed air into a computer that you know is turned off, unplugged and well away from an outlet, only to discover that it has a faulty capacitor that arcs as the ozone-safe-but-terribly-flammable gas blows through it, sending up a fireball in your face. (I only lost some eyebrows to that)
MH/ME: Finding a magnetic monopole and creating a new universe in the lab, only to find that it doesn't self deteriorate into its own pocket universe through a micro black hole, but succeeds in creating a new big bang in your house.
MH/ME: Discovering the secret to a lower energy state and successfully ending the whole universe.
ME: I believe it was said best by a friend: Death by sexual exhaustion.
ME: Standing inside the LHC during a firing sequence (assuming the near perfect vacuum and near absolute zero temperature didn't kill you first). Apparently there was a Russian who stuck his head inside the beam path of a collider in Russia who, aside from a host of medical problems (cancers, blindness, brain damage, etc), one side of his face has stopped aging.