I may have mentioned this before, but I had an old enduro with some title issues when I was 18. The DMV, after 4 hours bickering with me, issued a temporary permit to operate (the DMV used to do this in the early 90's) it until I cleared up their questions on the title. I finally did that, was on my way to the DMV, and a local cop pulled me over. He stood there and tore up the temporary permit to operate in front of me and impounded my bike for not having proper registration >

Little did he know that I was being followed by a good friend who witnessed the whole episode ;D We ended up getting him suspended after talking to his captain.
Not completely a DMV nightmare, but one that never would have happened had the DMV simply accepted the signed reg card I had when I bought the bike :
Good luck on the test, babe. You'll do just fine!