There are two candidates for worst play I've seen in a theater. Both were when I was in college, and each was, mercifully, the one play of the year that I could exempt myself from (for other studies).
One was "She Stoops to Conquer" in my Sophomore year -- the only thing fun about it was the wigs the ladies wore...and what made them fun was the absolute lack of mastery the ladies had in moving about the stage with the wigs on their heads. I had to leave at intermission for fear of laughing out loud at anything more ludicrous than what had gone before.
The next -- a deadly dull presentation of "Darkness At Noon" -- was the first production of my Senior year. It was abominably "acted" by one of the most miscast group of people imaginable.
Lines were "recited". I was appalled that esteemed classmates were involved with the production.
Of course, I was in a couple of turkeys myself. One was a one-act called "The Monkey's Paw." I was a wet-behind-the-years "young" Freshman...and I played the "old man" in the story. I hadn't a clue how to sound -- much less "move" -- like an old man. This was one of a series of student director-directed one-acts, so...! The director of the one-act, Kate Swofford, actually went on to become a professional director, mostly in television.
Another, in my Sophonore year (it was a BAD year, apparently) was "Antigone". I was a member of the chorus. We weren't bad...but our costumes were bad, our makeup was bad, the set was blah/bland, and the direction was very lacking.
(TomovOz, it was this production I sent you a picture from several years ago).