This went with a bit of a pop.
6am one friday last month on me way to work. I didn't know the battery wernt charging, so when it started spluttering and i booted it, there was enough lectric to power the fuel pump, but (im guessing) not make a spark. Then it did make a spark, then i nearly poo'd myself.
Where it's nearly still touching in the middle is where the strap goes, and i'd had a vain attempt at squeezing it back together before taking the pic.
Then i drove round with no back box for 2 days.