This one’s really got the blogosphere buzzing. Who the hell is Iamamiwhoami? Is it Christina? Goldfrapp? MGMT? Gaga? It could turn out to be a new Honda ad campaign, for all we know at the moment.
Trawl the Web and you'll see all sorts of theories and alleged clues buried in Facebook and Twitter feeds.
Whoever it is, these weird and wonderful teasers are dividing opinion and causing quite a stir. Place your bets.
If you've seen a video online that you want to tell us about email us via the feedback form.