According to H.P. Lovecraft, Cthulhu would probably rise from his underwater lair and devour me as I type, but luckily the stars have not yet aligned to enact this eventuality.
British prog-rock band Caravan present a healthy--and catchy!--fear of Cthulhu's return in their song "C'thlu Tulu" from their 1973 album For Girls Who Go Plump in the Night. The group has been together fairly consistently since the late '60s and still tours today, so evidently it's pretty easy to publicly taunt Cthulhu and get away with it.
Thanks to Caffeinated Joe, who first posted this song!