I’ve done it…

A Piedmont flight in the mid 80’s, the gate was changed at the connecting hub after I had gotten off my first flight and confirmed that the gate on my BP was the same as what was being displayed at the time. After a cocktail (or maybe 2…) I walked over to the gate, handed the GA my BP and got on the plane and sat in my seat. Remember that this was before electronic readers and the GA’s just took the BP and most of the time never looked at it, and the flights were at most half full, someone in your seat was never an issue. When the counts did not match they actually looked at the BPs and then quietly informed me that gates had changed and I was on the wrong plane.
Since then, I always look at the display at the gate of the plane I am boarding…