Someday, I'll be in a bad mood and you'll try to push past me and I'm going to channel superhuman strength and propel you from the mid-way point of the staircase aaaaall the way back to the platform, using only my pinky finger.
Then, of course, I'll feel bad and walk back down the stairs to see if you're okay. But note, we could've avoided this whole catastrophe if you would've just minded your manners and stayed in your place...