If you are a little kinky in the bedroom, here is reason 1- 193746579301201 to never ever piss off your boyfriend. 
A man in Minnesota is under arrest after the attempted murder of his ex-girlfriend. How was he planning on offing his lady friend? A "vibrator bomb". 

Terry Allen Lester, took apart a black vibrator (that's probably where the jealousy issues started... just saying), placing gun powder, BB shot and buck shot from shotgun shells into it. He connected the black and red wires that connected to a trigger with a battery port, according to the criminal complaint.
According to the complaint, Lester had told his former roommates that he planned to give the sinister device to one of three ex-girlfriends as a Christmas present, telling them his relationships with them had "ended badly."
Look here are the lessons to take away from this:

1. Dudes can be totally insane too about ex's.

2. Never ever use a vibrator that an ex-boyfriend gives you.