It was at an Applebees and the waitress was one of the worst I've ever had. Took forever to even ask what we wanted to drink (there were two of us). Screwed up the order. Screwed up when she tried to fix it. Never came around for refills (I finally got up and got my own at the wait station), and generally spent most of her time BS'n with her other waitress friend and standing around with her face buried in her phone. Worse, she acted like it was an inconvenience to work there.
I had to flag another waitress to ask if she would flag mine down my actual waitress for the check.
I left two pennies on the table and wrote on the receipt - "My two cents - find a different job because you suck at this one."
Every other time it is 20%.......25% for good service; once while eating on the road, I left 40% at a Dennys because the waitress was awesome (friendly 60 yr old woman that was very courteous)
Forgot to add that was the last time I ate at an Applebees..........11 years ago.