Recently Pillyrider asked about helmets for sidecar passengers - brought back fascination with sidecars and what it must be like to be in one.
Bro in law has sidecar hitched to '73 Bonneville, originally to haul camp gear to Elephant rally:his girlfriend rides in it now. Low down with thin metal jacket = scary not bothered though. Ignorance, trust, love not sure.
Should ask for a ride next time perhaps.
As a footnote - Real Classics has an item about riding a bike with a chair:-
Sidecars are asymmetric. And although they don't fall over when you get off them, they could never be described as stable. When you accelerate, the bike wants to overtake the chair, so the whole outfit slews to the left. When you brake, the chair tries to get its own back by overtaking the bike, and so you slew to the right. With the toe-in and lean-out (or is it the other way round?) set properly, the bike will manage to hold a straight line on a gentle throttle, unless you happen to be riding at one of the many harmonic speeds which set the bars flapping from side to side. 