I'll admit it. I just did this the other day.
Now, I make sure I have the stitch maker on the needle that I need to have in my right hand to start the next round.
How many of you have cut your tail, or at least thought you were cutting the tail, and actually cut the working yarn???
When my 10yo DD did it I thought it was funny.
Then I did it at a Knit Together cause I wasn't paying attention and then she got the last laugh.