PADI dive manual says the B in BWRAF is for BCD, its not it's for buoyancy. If you squirt a bit of air into your drysuit and it dosen't come out of your dump valve then your zip isn't closed.
TIP Always do a BWRAF on yourself before leaving the car, as it saves you looking a plonker at the waters edge with everyone watching.
I have done many daft things but I have always noticed myself before anyone else had the opportunity to take the p1ss by following this little technique.
By the way Dave you're a pussy I would still have done the hour
