To do a Perko is to get stuck while following an imaginary road; one that only the driver can see.
Can you see the imaginary road?
Even Perko got out to look for the road,
too bad, too late!
He thought it was sand, but it was
with a layer of sand on top!
To do a Lawrence is to get stuck on no road at all.
But, the real challenge is to perform an Advanced Lawrence!
An Advanced Lawrence
To do an Advanced Lawrence is to get an accompanying vehicle stuck at the same time.
Notice that the sun is going down as the tide is coming in.....
It just can't be done much better than this!