Lately I've started being mischievous towards normals who have the perceptiveness of an average smartphone user.
When I'm in an Elf II from Koleje Wielkopolskie and I happen to be the first person at the doors, I push the door opening button early. Then I just stand there and wait for the doors to open, while people behind me start panicking that nobody's pushing the button.
Of course it's highlighted as already pressed the whole time.