
of 17th CENTURY philosopher
René Descartes.
The Big Bang Theory Season 12, Episode 10

...to function in 18th CENTURY Vienna.
The Big Bang Theory Season 4, Episode 21

Corn dogs didn't come into existence
till the first half of the 20th CENTURY.
The Big Bang Theory Season 2, Episode 2

It's the 21st CENTURY.
The Big Bang Theory Season 5, Episode 17

Should I read you some bawdy
19th CENTURY limericks?
The Big Bang Theory Season 11, Episode 11