Ran across a really nice white F10 M5 today (in Mexico).
We played a bit on the highway, then took same exit and ended up lined up at a red light.
We both took off slowly on green, and punched it going about 10 mph - I hit it first, jumped ahead, and kept pulling.

It was colder, and no LSD yet, so traction was an issue with DTC one-push off, and ASC kept lighting up until I got into 3rd gear. Then I actually let off briefly a couple times since he was falling back quickly and I wasn't sure he was still racing ... but he was

I ended up 2-3 cars ahead by 100 mph.
Driver was cool, gave a smile and thumbs up, I did too but not sure he saw me through the tint.
Fun times, good runs.