From The Weakest Link:

Question: What conservative leader became the first female prime minister of the United Kingdom in 1979?

The contestant incorrectly answers Tony Blair (the answer is Margaret Thatcher).

After the round, host Anne Robinson comments, "My friends back in England will be surprised to know Tony Blair has been prime minister for almost 33 years!"

If Tony Blair were elected prime minister in 1979, he would have been prime minister for almost 23 years, not 33!