That happens to me far too often.
Here's the link I intended to post:
http://www.youtube.c...tch?v=uT3SBzmDxGk
The other link is a Haydn piano piece my 10yo is playing. Yesterday night he was goofing around by transposing it on the fly into various keys, at the same speed that video plays it. He was doing fine until I asked him for D minor... ;-)