Sometimes, folks go above and beyond what is asked of them. Listener Jamie McCormick, in addition to submitting her theories as to when the first Dracula spoke the first "Bleh!", also generously provided a list of more recent cultural references to that odd vampire parody sound. This was a tremendously kind gesture given that it will (probably) have no impact on whether she wins the coveted prize.
McCormick noted that "Bleh!" was chanted repeatedly by a vampire character in the "Pink Plasma" episode of "The Pink Panther" (episode 78, from 1975); spouted by Count Drakeula in the "Ducky Horror Picture Show" episode of Duck Tales (episode 32 from 1988); and uttered nearly continuously by Count Blah, a friend of Greg the Bunny.
I’ve included all of them here to bring some animated levity to your otherwise-predictably-gory Halloween viewing.
"Blehs!" start around 3:16.
First “bleh!” around 4:17.
Editor's note: Language NSFW, despite featuring a bunny.
On a related cartoon note, Anna Brawley wrote in to say that she thought there was an old Bugs Bunny short with the same plot as “Pink Plasma” that was made in the 1940s; but I think she is referring to “Transylvania 6-5000” which does feature Bugs getting chased by Dracula, but which was actually made in 1963. It isn’t the winner, and it isn’t big on “bleh!”, but you should absolutely watch it anyway. It’s truly a classic.