Yeah, a few times probably, but one instance comes to mind.
I directed a play in High School. I know, this sounds petty already, but stick with me. Anyhow, a friend of mine was "helping". She was supposed to do set direction, while I worked with the actors, but she consistently skipped rehearsals saying she was "tired" or "had a lot of homework". Anyhow, I managed without her, until a few days before the play went on, whereupon she decided to show up for once, chewed me out because I had "taken her job", threw a fit because the prop directions were lacking, and insisted I apologize to her for "disrespecting" her.
After the show was over, at our graduation ceremony, someone was given a special award for directing the play. Guess who it was. I'll give you a hint, it WASN'T the person who'd stayed late every night herding a bunch of hyper high schoolers into a decent production, who'd invested time, energy and patience into crafting a good show. Nope, it had to be her.
Ef that.