Ronald Reagan was with Queen Elizabeth at Windsor Castle one morning, and since they shared a love for horses, they decided to go riding together. Some distance from the castle, as Reagan was following the Queen up a small grade, the Queen's horse decided to loudly expel gas in sync with each step.
Embarrassed, the Queen turned around and said, "Oh, I am so sorry, Mr. President."
"No problem your majesty," replied Reagan, "I thought it was the horse!"