Skipping on the railway

[D STROYER]

One day, a brunette was skipping on some train tracks singing "21, 21, 21, 21,...''''
Along came a blonde who thought it looked like fun.

So she joined in and started singing "21, 21, 21, 21," and then a train came.

The brunette jumped off the tracks but the train ran over the blonde.

The brunette got back on the train tracks and started singing "22, 22, 22, 22,..."