My sons bought me one of those suitcases with wheels for my birthday so I would have new luggage for my trip to Los Angeles. One thing I learned pretty quickly is that when you get on an escalator it's better to push down the handle and carry your bag.
Network Rail in Great Britain made this montage of escalator falls at the Leeds station to promote safety. One thing I noticed is how many times people fall over their rolling suitcase when they get on the escalator.
Source: You Tube