Just read through the whole thread annnd.. . .
Tipped zero dollars tonight and totally got away with it 
You're an awful person.
It is impossible for me to tip at Sonic. They do not have a "add tip" option on credit cards sales.
I've heard from friends at Sonic that this has dramatically reduced the tips they were used to making.
And Wacky- nothing is worse then taking care of a table where the parents don't care about the mess their kid is making and then leave a crummy tip. Where I work we have "vintage flooring" so all that cut up food that got tossed around takes a good amount of effort to clean up. This leads in to the whole "takes time away from other tables" idea.
I feel like we need a thread like this for people in the service industry to vent and non service industry people can comment.