Hard to pinpoint, could be my first route with my dad after buying a rope at Tiso's the 'Runnel' in sneachda, or soon after my first rock route the Cioch, Applecross, followed by hitching a lift on the back of a motorbike down the Bealach na ba, maybe winter climbing after work in the Lakes with full moons, starry skies and deserted summits, or DWS anywhere!