Flying high, in some countries known as Airplane. Best slapstick comedy ever.
Honestly, it seems impossible to judge between Airplane, The Naked Gun, Bringing Up Baby, and Spaceballs as the best slapstick.
All great movies, but as direct parody and spoof, Spaceballs' jokes were so dependent upon people having seen and holding affection for Star Wars. And Naked Gun was very funny but always felt like a spin-off of Airplane. Technically, Airplane was a "spoof" of disaster movies like Airport 1975, but it's jokes were not directly derivative of those as Spaceballs and it didn't matter if you'd seen those serious films first.
Never saw, Bringing up Baby, but now it's on my list.
I have quoted something from Airplane almost every week or the last 39 years, and I guess Airplane II since when being introduced to multiple people and we're all shaking hands I say "Unger, Oever, Oever, Dunn", often to confused looks.