Sense Sonnet - Tickler

 Train Wreck

An instructor, training a sperm

For conception to undergo.

As teacher taught, pupil did squirm.

Training was going very slow.

"When the siren goes off, rush out"

"The tunnel," the instructor said,

"And swim along the proper route,"

"Till coming to the egg that's red."

The real test came, sperm gave his all.

Fast the sperm went, swimming along.

"You're my egg," he told the red ball.

"No, I'm the tonsil, you turned wrong."

Instructor sighed, said, "What the heck!"

"First time I've had such a train wreck."