Demo to term sheet in 3 hours
I met the Electric Imp team in April. I had bumped into one of their engineers at a party and he pinged me a few weeks later to say he was working for a startup and the company was raising. The company came in to the office on a Monday at noon.
Hugo, the founder, Electric Imp demoed their product to me. Ten minutes in, I stopped the pitch meeting, pulled 3 partners from their Monday partner meeting, and issued a term sheet that afternoon. The demo was just that compelling.