Lucky you survived that Mugen

And to as a possible reason as to why you were laughing, could it have been the Adrenline perhaps.

I know it makes me laugh uncontrolably when i come out of a dangerous situation alive.
also my dads mate did the same thing with an old ford mustang with a turbocharger and ended up doing the rolling car trick in front of the local police station

and got six month community service and a £5000 fine.
P.S sorry bout the double post my internet conked out then restarted resulting in the sending of my post twice