I did that when I first started trumpet!
I found a garden hose about ... eh, .... well, no idea how long it was, but it was in F#, right above an F horn, I think. But this was before I played horn, so I wasn't good with the partials. The intonation on the hose was pretty poor, I couldn't lip the out of tune partials in tune and the intonation varied from octave to octave. Thing sounded really cool when I went for maximum volume, really buzzy and brassy and dark.
Listen to the trills above... teehee!
Hehe... never heard it done lead trumpet-style!
I'm not sure about if this is real, but I suppose it is, since this next one is real and it's the same guy.
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I should really invest in a hose and make a new one. I don't have the old one anymore, it was filthy anyways.