This is referencing the absurd crash from the very end of Formula E's debut race, the 2014 Beijing E-Prix. Nicolas Prost scored pole for Renault at the event and remained in first position until the final lap, at which point Nick Heidfield (who had worked his way up from 8th) made a pass for the lead in his Venturi. Prost practically rammed Heidfield as they were side by side, which sent the Venturi skidding into a sausage curb that launched it into the air, while also damaging his own Renault into immobility - ultimately allowing Lucas di Grassi's third place Audi to slip into the lead and claim FE's maiden victory.
The clip can be seen on YouTube here - everyone walked away unharmed from the incident, but it's still a pretty gnarly crash so be warned. It starts off with the incident itself, and then does a replay from Prost's POV at 1:53.