As many commenters suggested, I really should have included this in the top 5 etiquette blog! How could I have forgotten?!?!
I don't care if your friend or wife is just running up the escalator-- when the doors need to be shut, they need to be shut!!! Some passengers just don't realize the consequences when these archaic doors get jammed! It could cause a delay up to 10 minutes when these doors need to be fixed by a technician.
Someone held open the doors this morning as it was closing to squeeze in. Luckily, the train operator was open to close/open a few times to get it working normally again. This passengers was then scolded by the T.O. over the speakers-- GOOD! Glad that he was called out like that! He got so many stares in our train car that he walked over to the next one.