Strangest (but best) thing I've done on a commute:
Meeting first thing, so folded clothes into panniers, left cycle kit in spare room (no point waking the house), got a nice early night. Woke up, somewhat groggy, hopped onto the bike, set off on auto-pilot...
...to my favourite scenic lane, and took in a 62 mile tour of Kent and East Sussex.
Arriving back at midday, I was surprised to find my wife wasn't at home, given it was a Saturday... hang about. Oh hell! Cue hurried phone call to work and an extra few miles.
Those of you that know Kent will know it can be quite unforgiving to a touring recumbent. My recommendation, don't take a business suit along with you.
Strangest (but worst) thing I've done on a commute:
Steered towards Anerley.