excellent thread - pissed me off just reading it. It is almost inconceiveable for someone to get on another persons bike.
the only time (that I am aware of) that someone threw a leg over one of my bikes was a gal that I work with (who also rides) who was interested in the seat height. She had parked her bike right next to mine, and even though no one saw her, she came right inside and told me she did it, she was very worried that I would be mad.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter