Sand.
Ouch has anybody actually done that ? Doesn't it positively spew sand all over the place ?
Landed on sand at an organised Rally, in a Turbulent with a VW engine that is an absolute bu**er to start, so decided not to stop the engine in case the incoming tide beat the starting / swearing exercise, then realised that the stationary vibration was digging me slowly lower into the soggy sand, so kept on the move until I could position myself for a departure, missed the cucumber sandwiches on the beach, but enjoyed the experience nevertheless. Now - if I can only get a VW to start with no electric starter or impulse mag - I might join the next Rally. Hose the beast down when you get home - salt, sand, ever wondered why flying boats are so uneconomical ?