Kit bashing.
Scratch building.
RMwebing.
LNER OO gauge.
Some LMS and GWR.
Building exhibition layouts.
Long walks in the snow at night.
Throwing rocks at campers and avoiding humans with cameras.
It took me ages, (ok, nearly 3 full minutes), to find the tiny little "here" hidden in the middle of a long paragraph. Already voted - DMUs 100,123, 124 and some PW stuff.