A father and son altercation over a Lego collection turned to fisticuffs when the father allegedly threw out the son's colorful building toys.

Nicholas Melice, Sr., 46, and his son, Nicholas, Jr., 19, were found bruised and scratched when a police officer responded to the house in Port St. Lucie, Florida, around 11pm on Tuesday.

Nicholas, Sr. was allegedly intoxicated and tossed out his son Nicholas Jr.'s Lego collection, causing the pair to come to fisticuffs.

Nicholas Melice, Sr., 46, was accused of assaulting his son after a fight over Legos

Nicholas Melice, Jr., 19, was not happy that his father allegedly trashed his Lego collection

The officer said he could not tell who was the 'primary' aggressor, according to The Smoking Gun.

According to the police report posted on the site, after the pair got into an argument about the dad trashing his son's Legos, the father pushed his teen son and the teen struck back.

A sister said she witnessed Melice Jr. punch his father multiple times.

'Both Mr. Melice and Mr. Melice Jr. advised they wished to pursue criminal charges,' wrote the officer in his report.

Father and son were booked on misdemeanor battery charges.