SvenNYC:
(Separate from the orange warning spheres, but possibly of interest nonetheless) I believe there are also weights that are placed on lines to reduce the movement caused by winds. There's also cable designed such that it is not completely circular (round) so the wind doesn't have an even surface to push around.

George Corron:[quote]...can grab a line and put the pocket with your keys in it near your partner and shock the living crap out of him...[/b]

Do you work all the way up high with another person that close to you? I can just picture it now:

Zzzzap (snicker)
"Oh yeah? I'll show you!" ZZZZzzzap
"Hey, cut that out!" etc., etc.