Check your batteries!
 

While mine has not "exploded," I did take off the battery cover a few minutes ago to find an ugly fist-sized ball of cauliflower corrosion where the nice, clean positive terminal should be.

I already have a service appointment next week, so I'll leave it to my dealer to decide what's up with my battery and if I have any positive terminal or battery cable left (not like you can even make out the bolt holding the cable on under all the corrosion...)

Guess what me too, not quite that much though...
 

Have you had any trouble starting your car?

No problems with starting or electrical, just LOOKS really nasty...
 

BTW, despite reports to the contrary, my new washer fluid filler cap has also cracked at the hinge, just like the old one...

Ewwwww!!! I'm going home to check this minute!!! I won't have anything to do w/corroded terminals!!!

My negative terminal was loose.
 

Needed a jump at the garage yesterday.

You don't even have to REMOVE the cover; positive terminal is on the passenger side of the battery
 

I just popped the hood and peeked under the side of the cover and saw the growing glob which prompted me to remove the battery cover and go "ewww..." (and be grateful that my battery compartment wasn't completely corroded like I believe it was LarryTT's...)

Checked mine last week...looked the same..big crusty ball of corrosion to on terminal

You guys all winter drivers (i.e. Salt)?

No salt (or at least minimal salt) here in Colorado...

Mine is 25 months since purchase and clean as a baby's behind. Keep your terminals tight!
 

I think that sometimes a slightly loose terminal can cause corrosion from arcing and whatever gaseous reaction causes the crud.

Perhaps an overfilled cell that produces gas bubbles when charging and escapes through the battery vents, then settles underneath the cover can be a cause too.

After cleaning, spread some vaseline over the terminals and battery post to keep out the air and prevent the reaction from reoccuring.