Jekyll and Hyde...Together Again is a 1982 comedy based on the novella Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson. The film is more like a cross between the original story and some aspects of The Nutty Professor. It stars Mark Blankfield, Bess Armstrong, Tim Thomerson, Krista Errickson, and Michael McGuire. Wikipedia
(Tries to flush the powder down the toilet but grabs it at the last second)
Dr. Jekyll: How stupid of me! What if this had been flushed out to sea? How callous of me, not to think of the fishes and the dolphins and the whales and the pelicans... they could be damaged by this terrible, terrible... ohhhhh...
(starts cutting lines from the powder)