“Blowing Up B & Q”

There was an English man, Irish man, and a Scottish man who all wanted to get into the RAF. So the English man went up to the Sergeant and asked him how to get in the RAF. The Sergeant told him he had to blow up a building without anyone seeing him. That night, he went to blow up a building and then went up to the Sergeant and said, “I’ve blown up a building without anyone seeing me.” The Sergeant asked, “How many letters in the alphabet?” The English man replied, “26.” The Sergeant said, “Right, you’re in.” The next day, the Scottish man did the same and also replied with 26, so he was in too. The day after, the Irish man went and did the same but replied with 24. The Sergeant said, “You must be bonkers because there are 26 letters.” The Irish man replied, “You must be bonkers because I’ve just blown down B & Q!”