http://www.drbukk.com/gmhom/park.html.
I especially like this one:
Here's a superb example of 12-pack engineering. A mobile wood burning, forced air heating and air conditioning unit . Note the extension ladder supporting the ductwork. We all know the rule: "If the van is a-rockin', don't come a-knocking", but the more appropriate conclusion here is: "If the van is a-smokin', don't come a-stoking".
I especially like this one:

Here's a superb example of 12-pack engineering. A mobile wood burning, forced air heating and air conditioning unit . Note the extension ladder supporting the ductwork. We all know the rule: "If the van is a-rockin', don't come a-knocking", but the more appropriate conclusion here is: "If the van is a-smokin', don't come a-stoking".