A mini trombone used to annoy parents, siblings, etc. Sounds like this.
An instrument comprised of two horse hairs stretched across a hog's behind and picked by one's teeth.
A small flute pitched an octave above a regular flute. Fun to say.
Psst. Got something funnier? Add your own funny instrument.
Kudos to John Philip Sousa for this wrap-around horn.
Larger than a trumpet, smaller than a tuba, sounds like a cow with a cold.