The funniest thing ive heard was a proper row break out after a race at Suzuka. One guy was mad after what he said was a deliberate shunt on the final chicane. He still crossed the line first but a penalty for cutting the last chicane meant he came second behind the other guy.
Now I am english, and I love to hear a good argument between my East European chums in my language, and this one ticked all the boxes.
As we were a group of regular racers, the other guy tried to shrug it off at first, but then it was all like -
F*************************************************************************** YOU *********!!!
so the other guy was like -
REALLY? OH OK - F************************************************************* YOU ********!!!
and the the other guy was like -
NO NO, NOT F********************************** ME, F**********************************************YOU ************!!
You get the picture? This went on for quiet a while. I just remembered that I recorded it on fraps, and then remembered I had a clear out and its gone
gutted!
The funniest thing ive heard in real life racing was the Brazilian GP where the Red Bull team told Vettel he had a gearbox problem which let Webber pass and claim his only victory in the final GP of the season, yet Vettel went on to pretty much match his pace and encountered no visible problem.