Wikipedia:Obvious sock is obvious

There is no doubt these are socks

Yes, dear Wikipedians, an obvious sock is quite obvious. For instance: If Editor A is blocked for harassing Editor B and then a brand-new account, Editor C, comes along and mimics the harassing behaviour of blocked Editor A, then A and C are obviously the same user. This may also be called the DUH principle.

It all goes back to the old adage: "If it looks like a duck, swims like a duck and quacks like a duck, then it probably is a duck". It is very unlikely that new Editor C would share the same disdain for Editor B that was expressed by Editor A. Coincidences happen, but not that often.