I carefully think about how the waiter performed and then adjust the 15% (10%) rule according to how they did.
2 (25.0%)

I just give the standard 15% (10%), excluding tax. No matter how much I give, they would always think I did not give enough. So who cares.
3 (37.5%)

The waiters and waitresses are always so nice and even if they’re not, it makes sense since they have to work so hard! I always tip a lot.
0 (0.0%)

I notice everything they do wrong and then penalize them for it. I usually end up just giving them change.
1 (12.5%)

It all depends on how hot they are and how much they flirt with me!
2 (25.0%)