Putting sugar in bottles is really stupud, but a lot people do it.
If you check the progress of your brews then you should never get an exploding bottle.
If you are bottling a while batch of brew you should really boil some water and corn sugar for 5 mins and add to your bottling bucket.
If you ever get exploding bottles then they are OVER-CARBONATED. You need to place the remaining bottles in a cold area, like the fridge. The cold renders the carbonation process dormant.
I had several bottles explode on me, but they were all root beer.
I have never had a beer grenade. Funny thing is, I have beers that are over 1 year old and have NEVER been in the fridge.