HhhHaa, that reminds me of my daughter's reaction when a girl would loudly proclaim that any of my daughter's serve that went into the net were (ready for this?), "In the net... fault!" Her dad is one of the most competitive 3.5 hack ever.
This thread also reminds me of a 50s tournament player I used to play when I was a jr, who'd say, "SINGLEFAULT" on every out serve.
Yeah, sometimes 'the finger' is most appropriate. It's got to be stressful to be so pedantic on a tennis court. I wish people would just be laid-back and play some tennis.