The "16 Suspects?!" and "Conan, Heiji, and the Missing Boy" OVAs were pretty boring and contrived, but "Conan VS Kid VS Yaiba" was.....PURE CRACK. XD
Now I'd read the manga version of Kid VS Yaiba years ago, but for this, they had to throw the Conan characters into the mix too. But the problem with that is that all this BIZARRE stuff just doesn't fit into the far more logical Conan world. XD Like in one of the first scenes, Akako shows up in her witch costume to tell Conan's fortune with a floating crystal ball that talks. XDD And Conan is totally unfazed by this! They hardly even blink when she disappears in a puff of pink smoke WTF!
And then there's the whole thing with Conan seeing the Paikal and asking the old lady if he could drink it, hoping he could turn back to Shinichi. XDD And the old lady gives him some other weird blue liquid, and HE DRINKS IT. And he turns into....MOURI KOGORO. He's all "WTF" about this of course, and while everyone's chasing him because they think he's Kaitou Kid, he drinks some more and turns into HEIJI. XDD What is this, Alice in Wonderland?! I never thought I'd see the day when Heiji is thinking with Conan's voice.
Kaitou Kid was amusing too. In the Conan anime, we only really see his cool, mysterious side. We hardly see him screw up like he does in the Magic Kaitou manga. So seeing him here, crashing into a vulture on his hanglider, then fall screaming into a pond, only to bump heads with a giant talking frog.....man, that is entertaining. XD
In the end they had to turn the whole thing into a dream Conan had from reading too much Yaiba manga. A bit disappointing, but there really isn't any other way to explain all this stuff. It's just too bizarre. XD