Teachers at a Florida school were forced to improvise when they found obscene graffiti painted on the football field.
A prankster had marked graduation day by daubing a giant painting of a male's anatomy on the pitch, near where the presentation was due to take place.
Officials at Nature Coast Technical High School desperately tried to cover up the vandalism by using green spray paint.
However, the sight of a man's naughty bits caused many students to snigger as they went up to collect their awards.
"We didn't know where to look," said one student.