"why do we even have that lever" is made funnier by the fact there are only 2 levers to begin with (disguised as a pair of tusks on a statue)
i find the implications hilarious:
kronk only had to remember the location of one lever, and couldn't even manage that
but on the other hand, it's easy to get two identical unlabelled levers confused, this one's on yzma tbh
yzma only needed to make one lever to begin with, but she actively chose to turn the second tusk into a functioning trapdoor. she could have just...just not connected the second tusk to anything. it didn't need to have a function
upon reflection, this also answers the question itself: "why do we even HAVE that lever?" it's because yzma herself specifically designed it as a booby trap. "why do we have that lever?" because yzma had it built to keep people out of her secret lair! yzma made the very purposeful choice to put that lever there! and then both she and her inept henchman immediately forgot about her own booby trap! yzma that is YOUR LEVER!!!!!
