His lawyer calls it a foolish prank, but a judge isn’t laughing.

A 17-year-old high school student from  admitted in family court Thursday that he defecated in a classmate’s soda during an auto-shop class.

Prosecutors dropped an aggravated assault charge in exchange for the boy’s guilty plea to a charge of tampering with a food product.

Authorities say the victim sipped the soda, then spit it out as his classmates laughed on March 29.

A judge ordered the boy to serve probation, serve 200 hours of community service, write a letter to the victim to apologize – and to write a 1,000-word report on why it’s unhealthy to ingest fecal matter.