Hallucinations are bad enough. But after awhile you learn to cope with things like seeing your dead grandmother crawling up your leg with a knife in her teeth. Most acid fanciers can handle this sort of thing.  But nobody can handle that other trip — the possibility that any freak with $1.98 can walk into the Circus-Circus and suddenly appear in the sky over downtown Las Vegas twelve times the size of God, howling anything that comes into his head. No, this is not a good town for psychedelic drugs. Reality itself is too twisted.

Hunter Thompson, Fear and Loathing In Las Vegas

Thompson here alludes to an attraction in side the Circus-Circus Casino that charged customers $0.99 to appear on a giant video screen suspended over Fremont Street, the main drag of downtown Las Vegas, for 60 seconds.  For another $0.99, they could record an audio message.