Bryce, I'm not especially defending the longest title, but to break it down, I believe I'd parse the middle phrase as "sky high IQ" -- so what is very high, is the IQ of the victim. Also of the killer and the witnesses, but it's the victim that presumably we are saying "bye-bye" to. So the title may be silly or unneccessary, but it's not totally nonsensical.
Thanks for that insight, Ted! In all the years I've been reading or hearing that title, I never connected "bye bye", "sky high", and "IQ" in that way, but now that you mention it, it makes perfect sense. I'd also like to reiterate my appreciation for Lorenzo's suggestion about a possible meaning for "How to Dial a Murder"; that's another connection I had never made, but again, it now seems an obvious reference.
"Ransom etc" is a great title, David, I agree. It's one of the few that's intriguing all by itself, with the seemingly irrationality it suggests. I think that's a really good quality for a title to have; sort of suggesting something vague and mysterious, then having it understood only after seeing what the episode's actually about.