The Fence...
An old couple were out on thier 60th wedding anniversary and they decided to go to the place where they had first met.
After they had eaten the husband say's to his wife "Hey you remember that fence out back don't you?" His wife said" Why, yes Harold thats where we first made love" Harold then said "Well, how about we go relive the old time, eh?".
His wife agrees, and a young man nearby follows them out of intrest to see what this is gonna be like.
The old couple get to the fence, get naked and then start rocking and bucking like they were 16 years old! The young bloke watches until they finally collapse off the fence and asks them in amazement "How the hell did some OAPsl like you get that much stamina?!". The old man, who is still kinda dazed says "Well lets put it this way kid, 60 years ago, the bl00dy fence wasn't electrified!"