A Viking is off on a pillage, when his mum says to him "Be a love and bring us back a new kitchen sink, will you?"
So off he goes, burning villages and all that, but look all he might, he can't find a kitchen sink to take home. Just as his mates are hassling him to come back to the ship, he sees a coal hod outside a hut, and he thinks to himself "Mum's eyesight's not that good, maybe she won't notice the difference." His brother laughs at him when he sees what he's got, but when they get home, their mum's delighted with it.
His brother asks him "How did you get away with that, then?" and he replies with a wink, "Well, a hod's as good as a sink to a blind norse..."