Sure, but this is an isolated incident. I don't want to attribute to malice what could have been a total accident that day, maybe the kitchen was just busy. However, it was coincidental that it happened at a time when I didn't tip.

I'll keep that in mind for next time though if it ever happens again! Now I kind of want to do a social experiment.. go to a restaurant like 4-5 times and then don't tip once to see what happens. If its really true service is affected that way, then its a broader problem.