I did - but it's disappeared
A man approaches the foreman of a building site for a job. The foreman says he only employs Irish workers so that no-one will take the **** and upset them. The man explains that his grandparents are Irish and he gets on well with them.
The foreman takes a chance and leaves the man with his workers while he goes off to get supplies.
On returning he notices that all his Irish workers are on top of the building. One of them steps off, flaps his arms and comes crashing to the ground.
"What have you done?" exclaims the foreman. "Nothing" said the man, "we were talking about WW2 and I told them I was in the RAF and flew in Wellingtons"