Nobody has asked me to do that since around 2001. Something tells me they are a bit rusty at it.
I'm near KCHA. When I'm out in my motorglider near KCHA Class C airspace I monitor CHA approach to get an idea of what is inbound that I need to be looking for. I've heard those controllers over there make so many mistakes in the past 3 years it's unbelievable. Little things like clearing a C-130 and a C-172 for landing on the same runway at the same time. This was daytime VFR and KCHA is a pretty sleepy airport for Class C. Two days ago I was out flying and had an RJ inbound to CHA pass me less than 2 miles away and about 800' higher. It was obvious that the RJ's TCAS must have been alarming because he made a fairly abrupt late course correction about the time I saw him. I'm Mode C equipped, was squawking away and was close enough that the controllers at CHA should have been able to see me.