UKpaxman
Out of curiosity, are you 100% sure about that?
Roe 34 sounds an awfully long way back for an overwing exit on a 757, are you sure it wasn't the configuration with no overwing exits but emergency exits just aft of the wing (naturally slide equipped I presume...)?
Not saying you're wrong, but curious. Of course, if it is the no-overwing-exit configuration, it does just go to show rather that even self-determinedly 'bright' passengers who know what they're doing can be led astray by their own preconceptions - rather than the precise details of what's actually on the safety card ;-).