Thanks to Sandie for this:
A large truck was tailing my son
as he drove through town with his girlfriend.

The truck matched them turn for turn,
down every street.

My son's concern grew to alarm
when the menacing-looking driver pulled
next to him at a light, leaned out his window and
glared into his car. After a long, hard stare,
the man grinned and called to my son,
"Sorry, kid! I thought that was my daughter."