Oh yeah, all the time. And only on metal frames, my CF bike doesn't do it.
Rumor has it, in summertime in AZ you can hold a neon tube out there and it'll glow.
Also note the amount of sag in those big wires. The amount of current being drawn heats them a bit and causes the metal to expand, so they're hanging significantly closer to the ground! Say a prayer to the gods of Air Conditioning, and support your local Palo Verde Nuclear Power Plant