I was in the middle of getting my PhD when this happened. I remember thinking that my PhD advisor was joking but he was actually serious.

I was in the middle of getting my PhD when this happened. I remember thinking that my PhD advisor was joking but he was actually serious. He asked me a few questions that I didn't know the answer to. He then said he'd like me to go back to the lab and submit some more work. I didn't know what to think and I didn't think much of it. He eventually left and told me that I'm a "dumbass" for not submitting any more work. I was mortified. I thought that I'd be a laughing stock in the lab. But I wasn't.