5 things never to do when riding on an escalator:
1) Do not direct your burp at the stranger around you. Yes, we know you've eaten, and we know the food was good, but there are more civilised ways of expressing your, erm, gratitude.
2) Do not yawn and then look at the person standing beside you with your mouth wide open. Unless you have gold teeth and wish to donate a few to me.
3) Do not ask your kid if he/she needs to put put/do business/poop/do big business. For crying out loud, we just came out of a food establishment!
4) Do not stand in the middle as if you own the escalator. There are people who are in a hurry and you standing there, with the plastic bags at your side, are proving to be not just an obstacle, but the cause of a huge jam.
5) Do not fart. This needs no explanation. Unless, of course you are certain everybody else on the escalator has a blocked nose. If this should be the case, fart at your own will.