The Hanna-Barbera "Swirling Star" logo from the 1980`s scared me.Well,really,the logo itself wasn`t scary but the music creeped me out.Now,I think it sounds like someone walked into a restroom,flushed a toliet,recorded the sound of the toilet flushing,and synthesized it.
Two logos that scared the living hell out of me were:
LBS-Lexington Broadcast Services(was the syndicator for Inspector Gadget in the 80`s).Their logo had a very eerie sounding synth tune.The music was trying to sound happy,but instead had the opposite effect.
PBS-The weird P-Head logo from the early 80`s.Again,this was a logo that wasn`t really too bad appearance wise but had very scary music.It was at it`s worst on Sesame Street.If you can remember,the end credits of the show were simply generic white credits in a black background.Accompanying the credits was a creepy metallic sounding synth tune.Add that with the music of the PBS logo(which followed it)and you`d have nightmares for weeks.