Not quite a hat-tick, but I did pull a string of non-stop bumps from ORD-HPN back in August and September.
First American was oversold. [However, wanting to get home early I switch to a Contintal to Midway]
Then I had a string of Uniteds that were oversold both going there and back. 4 in a row were bumpable. One I was bumped to the American flight which ended up getting to O'hare earlier.