When asked by a member of the press what was the hardest thing he had to learn after he’d married into the British royal family, Prince Phillip replied:  “Using a peer’s bladder without smiling”.  The reporters looked at one another in puzzlement.  Finally one asked, “Sir, what is a peer’s bladder?”

“Well” said Phillip, “When the peers of the realm attend official ceremonies, particularly outdoor parades, they are of course constrained from simply excusing themselves from the grandstand if they must answer a call of nature.   So one straps a little rubber bladder – much like a small hot water bottle, to one’s thigh and fits it to one's plumbing.”

He continued:  “The trick is learning to use it without smiling.”