Meh.
Animation was good, so was the background music and everything. You did everything right, it was just a real stale idea that you didn't seem to execute well. Forget Pikachu on Acid. Apple.mov did the same thing, and it was a hundred times better/funnier than Yoshi tripping on Fruit acid. Going back to Pikachu on Acid I found that funnier than this too. Despite the stale idea(I honestly hate this idea in general mind you), they still managed to get me to smile through the tripping scene while I watched. I wasn't thinking, "When will this be over." while I watched that, unlike this flash.
Overall, as I have said, it's very good work. Just a very overdone and stale concept ruined the whole thing for me. Kirbophers voice acting was the only thing that stood out in the video.
I'd probably would have liked it better if Yoshi was tripping on that stuff that floats in the air in that one level. Would have made it less similar than apple.mov.