[David]

I'm just glad UBER added tipping. I was very uncomfortable not leaving a tip to the point that a few times I causally dropped a few bucks in the seat.

On a side note, my mother in law in Bangkok says us westerners screw up the tipping for everyone else. Like when I tip 100 Baht ($3) for a 1000 Baht ride from the airport or even 20 Baht for a 200 Baht ride across town. You give too much!