Dragon rush

I am by no means a great player. I am low silver and yet I have noticed something intriguing. The question I have to the fellow summoners would be, " which champion has the earliest dragon clear?"

I main Warwick as a juggler and if I spawn on the bottom then I can kill krug, Red Buff then Raptors, and immediately murder Dragon... This usually is at lvl 3 and I have not seen anyone else able to do it.

Just a quick update, My fastest time is 4:20.

Any thoughts?