Gamera vs. Viras (aka 
Destroy All Planets) (1968) – It’s easy call the later Showa-era Godzilla movies “juvenile,” but nothing holds a candle to these Gamera movies. These were definitely written to accommodate a pre-pubescent audience’s worldview, who would totally be behind the idea that 11-year-old Boy Scouts can outsmart not only scientists and other assorted humans, but also world-conquering aliens who hold the boys hostage (to secure Gamera’s compliance, because of course Gamera is a friend to all children) but have no concept of locks or other restraints and thus give them the run of their flying saucer.
The Naughty Nineties (1945) – The best Abbott & Costello features — or the most fun, at least — have a plot so thin it can barely be called a “premise,” allowing them to shoehorn shtick and slapstick in at will. In this case, the premise is that Bud and Lou an actor and stagehand, respectively, on a family-friendly riverboat that gets taken over by gamblers. Detours into shtick abound, including an excuse for them to run through “Who’s On First” yet again, and the final fifteen minutes are one of the best live-action Looney Toons/Scooby-Doo-style chase ever.
Bill & Ted’s Bogus Journey (1991) – What a misfire; it’s hard to believe that the same writers are credited. Part of the magic of the first one is that it’s a completely fantastic solution to a prosaic problem of flunking a history class; the only real antagonist is Ted’s overly strict father. Now, in the sequel, we’ve got a would-be world conqueror from the future and robotic doppelgangers, and Bill and Ted meet the Grim Reaper, and the Devil, and God, and Martians… It’s an overstuffed plot, without the simplicity of the original “How would two slackers use a time machine to pass a history class?” premise. It’s also an FX-heavy movie — heavier, that is, than the FX budget could competently support, so there are embarrassing shots all through. No wonder there wasn’t another sequel made for almost thirty years.