Replying to How should I break my laptop?

The title is a little misleading... I'm not looking for some some little kids thinking up ridiculous methods of destroying my laptop.  Here's my situation.

We all know that Dell makes shitty overpriced computers.  Well when I graduated highschool 3 years ago, despite my wishes to not get me a dell laptop, my grandparents did anyways (I love them to death, they just don't know anything when it comes to computers).  Well anyways, my shitty laptop is starting to really show how shitty it is.  The wireless card isn't working right, the fan is making noises about to explode, the CD/DVD burner isn't burning properly, and it's reading discs like a CD player from 1989.

I just found out today that my grandma got one of those 4-year "anything happens to it" college warranties, at the time she bought it.   I'm planning on buying an external hard drive for it anyways, so i'll take off all my data.  What I'm asking is how can I totally this thing without making it look completely intentional.  I don't want them to refurbish it.  I want it to be totaled so they just give me a completely new laptop.  I was thinking about water damage.

Give me your ideas and also a good cover story for the "accident".