Last time I went through EWR a colleague and I ate at one of those new restaurants where you order food and drink off an iPad at the table so now the waiter/waitress is reduced to simply bringing stuff from the kitchen or bar. My colleague put $0 in the tip payment when he checked out (also automated on the iPad) and when I asked him why he said that he hadn't been "served" so he wasn't going to tip. He waitered at university and said he earned his tips for the human part of his job and not just for carrying stuff to the table. I feel like he kind of has a point but I still wouldn't leave a zero tip. Maybe 10% or something. Thoughts?