Thanks Sluggo, but even if I have a good musical ear I can't whistle properly. It must be the teeth. And anyway, as you all can see I'm awkward in front of a webcam, the reflection of the monitor on my glasses doesn't help at all. Nor does the poor quality of the microphone (which I took from one of those cellphone handsfree thingies), that makes my room sound like the Death Star: listen to that low bass rumble! :P.
Add the challenge of speaking in a foreign language, whilst trying to be intelligible... I just did a quick thing hoping it didn't come out as complete gibberish. It's not like it's my first time, but it always feels like it.