I reckon that fence is around a yard."
A: A fence.
Put it in the back yard.
Because there is a lot of reposting to do.
They fence it.
Not enough cement EDIT: Okay thanks for pointing out that I messed up the wording but the joke is supposed to be the funny part
Oops, this was supposed to be for . There's no punch line!
A: Cos they've no idea of the route.