36squid, yeah signal beam is quite confusing. I never got this along with Psybeam and Extrasensory.
And yeah, Aurora Beam being a beam of 'excited icy gases' is kinda weird.
Well, a lot of things are unexplainable in Pokemon ;p
About the Ludacris thing, did you want to actually type 'ludicrous' or is there any pun that I just don't get?;p
I think he said some thing about an aurora beam in one of his songs xD, anyway I never got extrasensory either, I often raise an eyebrow at people in real life to see if it will work