My girlfriend flew SFO-ORD on Xmas eve and was offered a bump. She declined, since we wanted to avoid the risk of missing a connecting flight. Xmas morning from ORD-MIA we were again offered a bump, but declined since we wanted to spend more time in Miami before continuing onward. When we checked in for our flight from MIA to SCL, it turned out to be delayed for 10 HOURS.
So didn't get any bumps at all, despite the fact that they were offered and wouldn't have hindered our arrival at our final destination at all. Guess that's the anti-hat trick bump.
cnk