Blonde and Brunette on railtrack

There’s a brunette walking down a set of railroad tracks saying,”21, 21, 21…”

Then a blonde pulls up, gets out of her car, and says,”What are you doing?”

The brunette replies,”Just counting.”

The blonde says,”May I join you?”

“Yes,” replies the brunette. So the blonde and the brunette are now both walking down the railroad tracks saying,”21, 21, 21…”

A train comes and the brunette jumps off the tracks as the blonde gets hit. After the train passes, the brunette gets back on the tracks and says,”22, 22, 22…”