I had a thread about it, its a person who is absent minded and would not realize he is doing anything or everything wrong, i could see him overheating a light till it was burning hot and leaving it that way till the battery is drained (or even having it turn on in a blanket or other insulator making it even hotter), he could short circuit a few batteries in a toolbox or some other method, he may leave a light on till its drained well below the safe 2.5V then recharge it and continue using it oblivious to the low state of charge crystal possibility, he might put it on the charger and forget it on there for a few months (and if it continues trickle charging as some chargers do then thats not so good) and so on.
Lets just say if it can be blown up i can see him being the one to do it (accidentally of course, i know for a fact he can inadvertently invent many more abuses then i can conceive of and none of it would be intentional, he is just that absent minded)
Besides there are videos and threads about serious damage being done from exploding batteries.