If you have to do the "walk of shame" in flight, you're in an RJ.
If your flight attendant thinks that the Beatles are multiple VW's, you're in an RJ.
If your spoilers only have two settings (open and close) you're in an RJ.
If only vertically challenged people can see out your windows you're in an RJ. (POS 200).
If your rate of climb is less than 1000' below FL200, you're in an RJ.
If your F/O shows up with backpack in hand and thinks he's a finance guru, you're in an RJ.
If your company takes it in the tail pipe from their mainline partner...you are definitely in an RJ.
"Midwest Airlines, the latest victim of the present day Lorenzo"