Today was the 100th anniversary of

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the flush toilet, or as Larry Craig calls it the love seat. David Letterman

[Kutjara]

1. Cute joke, but...

...he's out by about thirty centuries. According to the Wikipedia:

"circa 26th century BC: Flush toilets were first used in the Indus Valley Civilization. The cities of Harappa and Mohenjo-daro had a flush toilet in almost every house, attached to a sophisticated sewage system"

[doc03]

2. Johny Carson made a joke about Sir Thomas Crapper

inventing the flush toilet for years. I looked up Sir Thomas Crapper in Wikipedia and you are correct. I learned something today, what good it will ever do me I don't know.