A spring Storm Petrel, doesn't happen every year.
Red-breasted Mergansers, which also don't happen every year; seemingly two males, one undergoing a retarded first pre-breeding moult, the other following a more standard schedule.
A Saturday evening of skuas and Kittiwakes and Arctic Tern and Fulmar and Storm Petrel, oh my! And a Sunday morning of very little at all saved by the reappearance of the two mergansers pretty much made up the weekend. And then it was home to a freshly baked fruit-cake. Oh yeeeeah!