How far back can you trace your ancestors?

Question:

How far back can you trace your ancestors?

I can get back to late 18th C Germany, but no further.

Best Answer - Chosen by Asker: Back to the man who did the first crap beside Stonehenge- the wooden one called Crap-**** Timber-Henge.
His name was Scattsbury Shitton., All us Shitesworthy's are descended from he.
We know about him from his faecal cave paintings involving men having scats beside animals.