My battery just exploded

Got up to take Dot to work as usual, got in the car turned the ignition and the battery exploded, there are bits of battery and trim all over.  Bit of a shock to say the least and poor Dot has had to walk to work.  
The battery was in bits and the acid eating away at my drive but the car radio was still playing and the windows still wound down. 
It has now gone off the the garage on the back of a big truck, hope I get it back in time to go to the pub tonight.