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I just love it! I first noticed it in last night's (S2 #18) episode, in the 1960s BATMAN, it came right after the announcer says something like "But wait, the worst is yet to come" and at changing of scenes.
Batman Transition - Comical Sound Effect (HD)

Well this is MY favorite ringtone: https://www.youtube.com/watch?v=EaJu23YZBpw
(I actually have it on my cellphone!)

I remember that! They should have more more Flint movies.