I, too, managed to lock them in once. Or rather a "helpful" friend did - as he was getting out he noticed I'd forgotten to lock the doors and reached over to the driver's side to lock them before getting out and closing his door. D'oh.

No power, no locks I'm not too worried about. If for some reason the battery is dead I can still use the key, and at that point I'd have a bigger problem to deal with ;-).

One more thing I just through of; as it stands at the moment, no vacuum, no locks. Rarely a problem, but sometimes I'll have the car parked out on the street and I'll go back and forth to get stuff a few times over the course of the day (or two) before driving again and at some point the vacuum runs out...

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)