Slide whistle glissando is an amusing sound effect perfect for funny animated cartoons and comical situations. It’s a great humorous illustration of something rapidly ascending or falling.

Slide Up – 0:01
Slide Down – 0:01

Slide Up Fast – 1/2 second
Slide Down Fast – 1/2 second

Wobbling Slide Up – 0:02
Wobbling Slide Down – 0:03

More funny sounds that you may find useful:
Jump Sounds
Funny Doink Sounds
Plop & Blob
Boner Boing Sounds