An apparently sports-mad parent from a Michigan high school has stunned authorities and triggered a police investigation after allegedly entering a rival school and defecating in a corridor.

The bizarre case unfolded at the Grosse Pointe South school with the parent a fan of fierce local rival Bedford high school. The two schools were engaged in a district championship football game on Friday, the Detroit TV news outlet WXYZ reported.

“This is definitely a first,” Grosse Pointe Farms detective Anto Trupiano told the broadcaster.

WXYZ reported that the suspect had been tracked down from surveillance video and claimed to have had a medical emergency. But police seem skeptical.

“The suspect entered the school through a doorway that was open for a band concert,” Trupiano told the TV station. “He then proceeded to walk around the school, pass several bathrooms, turned the corner stepped into a doorway and defecated in the middle of the school.”

The Grosse Pointe public school district said in a statement: “This behavior is wholly unacceptable and is inconsistent with the standards of conduct and respect that the district expects of anyone entering its school facilities. While interscholastic athletics provide students with valuable lessons in teamwork, sportsmanship, perseverance, and respect, those lessons must also be modeled by the adults who attend such athletic events.”