Any time you don't expect much from a day and it turns out superbly.
Soloing 40 routes in 3 hours on a sunny day at Birchens.
Bouldering on a Sunday evening as most people have headed for home and the sun nears the horizon.
Snatching Left Twin on Aonach Mor before catching a flight home in the afternoon. A great day out.
Ice cragging Rjukan-style.