to try to swipe into a secured entry area, that is not the actual key for said entry.
Things i have done recently which have amused me:
Repeatedly tried to get into my block of flats using my oyster card. Inerestingly, the key fob to my flat is a disc of grey plastic. Not really oyster cardlike. Similarly, the kirbi grip I used last night to try to gain entry- not really like a grey plastic thing.
I tried to use my phone to swipe into oxford cirtcus tube recently.
Repeatdely. There are loads more, I just can't think of them now.