Two couples on holiday, and husbands Jim and Dave decide to try and get their ladies to wife swap.
Amazingly they agree but Jim knows hiw wife is on her time of the month so he has got one up on Dave.
They agree that at breakfast they'll tap the spoon on the table to show however many times they shagged the other's missus.
Next morning Jim grins and taps the table twice, looks across at Dave who smiles then taps once on the jam and three times on the Nutella!