Brocken spectres are a bit like otters, mountain hare and adders. You spend years in the outdoors and never see such things, then when you do you see them with some frequency. I saw my first brocken on Blencathra in Cumbria a number of years ago and it was a really good one. The grey, rainbow ringed and huge figure marched alongside me in the mist, eery and threatening; it wasn't difficult to imagine why in times past it would have been a cause of fear.
On this morning, I ascended out of the beallach between Beinn Dorain and Beinn an Dothaidh with the sun on my back, the mist in Coire an Dothaidh and a ghostly brocken spectre cast upon it. Phenomena such as this never fail to fill me with excitement and joy; on this occasion, a rather dull climb through bog, along stony slopes and with few views suddenly became memorable. There's always something to be glad about.