Pavlov and the water jug....

Just got home from my part time gig. I work as a waiter / bartender in the banquet department of a downtown hotel.

It was an ok evening; a wedding, which means most people are relaxed and not too demanding. And some are actually interested in having fun and joking around :).

This was my first shift in a while, so a couple things I've already noticed, really stood out tonight.

1st - It seems that when people notice I've got my hands full, they feel a need to offer me just one more thing to carry. Why is this? Don't people realize that if my hands are full with four dirty plates that I likely can't manage a fifth? Are they afraid that if I walk away then I will never come back?

2nd - As soon as people see me coming by with a jug of water they feel a need to chug back as much water as they can. I understand why people do this, I often can't come by when your glass happens to be empty, so you figure you'd may as well get it filled up while I'm there. That makes sense, but it is pretty funny to see from the my perspective. I walk in carrying a jug of water, and instinctively people start drinking water.

This 2nd observation could be the makings of quite an interesting psychological case study or experiment. What else can we, the waiters of the world, condition people to do when we carry jugs of water near their table?
If we brougt 8 people in to a room, sat them at the same table and let them observe all other tables get there water re-filled after they've exhibited some unique behaviour, how long until the 8 subjects begin mimicking said behaviour?
What behaviour would you like to see?

How about if people climb off their chairs and sit on the table, facing outwards with their feet on their seats? The moment they observe me walking by with with a jug of water, the stop all chewing or conversation get up, turn around, sit on the table, feet on their chair, and stare blindly ahead. I'd then walk up and fill their glass with water, at which moment they come back to life, sit back down and carry on as though everything is fine. Perhaps a little Monty Pythonesque, but still something different

How about you? Anything you'd like to see people do before their water glasses were re-filled? How about other pavlovian responses you'd like to see people conditioned to give?