I and my 2012 Focus Titanium with auto trans and 2500 miles were in the McDonald's take-out lane. I moved ahead a car length and braked to a stop in drive. After about 30 seconds at a stop I heard a very noticeable clunk and watched the engine rev up to about 3000 rpm. It stayed near 3000 rpm for about 5 seconds and then dropped to normal 700 idle rpm. I pulled ahead another car length and stopped. After a few seconds the engine rpm again climbed to about 3500 and stayed there for 5 – 10 seconds then dropped to normal. This time no noticeable clunk. I heard the engine rev up a lot on both these 10 second incidents but no feeling the car was in gear trying to move forward against the brake. Both times the car moved forward completely normal after the rpm dropped. No, my foot was not accidentally on the accelerator. The car was in drive before and after each incident. Consulted Service Manager and was told since no check engine light came on he could only keep the car and run with a recorder. I declined, hasn't happened since. Anyone else seen this?