This just occured to me this morning on my way to work but what things would the old guys pass on to younger dubbers that have been learnt the hard way? To start off:-
Don't drive through deep water with the heaters turned on! Or put another way- if you want to find all the spots steam can get into the car then drive through etc!
Don't try to polish the pulley with the engine running and a loose rag!

hahaha i polish my pulley like that every time!!!!

how about make sure you have a battery cover or hidden terminals on your battery, otherwise u end up with a hot bum.
or
dont stand on the breaker bar when trying to do up rear axle nuts unless you want a broken ankle

don't armoural the steering wheel
do not start the engine after a petrol clean up

Check the fuel tap is turned on before driving, particularly if you get on to a major arterial road within 50 metres of starting.

haha the heater channel thing made me laugh. Kinda makes me wanna go and do it now. VeeDub sauna?

I have done it whilst driving barefoot - Nearly scalded my right ankle.

beware the beetle hood hinges with no hood bolted on
those springs have some serios bullshit tension

i will always have a scar to remind me of that little lesson

when you build a type 4 engine, you bolt the heads on, insert the pushrod tubes, with sealant, throw your pushrods down, bolt on the rocker gear... and then notice your bits of under cylinder tin on the ground. Then have to pull it all off.

Similar story for the bits of tin that go behind the fan housing, but not as messy.

do not rest the jets you're changing on the top of the fanshroud, as they WILL fall down and fall into the tinware cavities!!!

the decklid and/or bonnet is always lower than you think, so watch your head