My boy Sunny would howl on cue. We had a little "howling song" that we would sing, and that set him off. Also, the phrase "you're only a dog and that's all you'll ever be" would result in instant howling! And once started, he would continue. I have a video where I picked him up and held him upside down, and he continued to howl!
Ocotopus' garden
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http://www.youtube.com/watch?v=x5DyBkYKqnM
there might be a moral in there somewhere, but i'm not sure
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I enjoyed the video, whilst in Kefalonia snorkelling i saw several Octopi , i think they're fascinating creatures. The ones i saw stayed very still, don't think i'd of been so keen if one had shot towards me.