That reminds me of one time I played in a 1e game and turned up with my 2e players handbook.Says who?
You could play a 2e ranger at a 1e table.
The DM wouldn't even let my (pre-generated, by the DM) wizard use the 2e version of Protection from Evil. I'd assumed he'd given the character that spell as a defence against the mind control powers of the vampire we were opposing; I guess he must have liked the idea of +2 to AC.