Whatever you do don't say "Doesn't it get a little warm in there?". When a simple 'ja' or 'nein' would have sufficed, I was treated to a 15-minute lecture on the machine's aerodynamic and related ventilational properties. In German. All very interesting, but it was almost dark and I had to be up at 3 the next morning to ride a 1200.
He doesn't like twisty roads, preferring the Bundesstrassen back home. He said he'd also taken it on the Autobahn, and as someone pointed out, he could get away with it because no-one would imagine that it's really a push bike.