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There's a specific example I wanted to add if it's not there yet, but... I don't know what trope it is (if any). Basically it's a physics screw-up.
The example in question is in Doctor Who NS S1 E13. Rose decides she needs to rip the control panel from the tardis, so they attach one end of a chain to said control panel, and the other to a car (a Mini, IIRC). After much revving and no ripping, the chain breaks.
So what do they do? Go and get a fire engine. Er, guys, the thing that went wrong here was the chain. You need something that isn't going to break. A fire engine will just break the chain more quickly if anything.
Anyway, it works of course.
So what trope might that be?
Edited by jumblejumble