A convenience story customer and a number of elementary school parents got a nasty surprise in Vallejo, California this week, when the man left his prescription medical marijuana cookies on the counter, and a fifth grade student was allowed to take them with him to school.

The student shared the cookies with several of his classmates, all of whose parents were called when their children felt “ill.”

Watch the video from the local Fox affiliate, which first aired March 5, 2011, below.