When cops in Palm Springs, Florida responded to a call about people getting down in the back of a car in a public parking lot they say they showed up to find 45-year-old high school principal Krista Morton smoking weed ... with a student ... with her shirt open. 

According to The Associated Press, Morton tried to say she'd just met the 18-year-old, but the student revealed she was the principal at Mavericks High of Palm Springs. 

Police said they opened to door to find the couple in the weed-smoke-filled car where Morton had her shirt unbuttoned with her shoulders and part of her chest out.

Both Morton and the student were arrested and charged with possession. Morton got suspended from her job, and the young man got a story he'll probably be telling for the rest of his life.