Eighteen years AGO,
I sent the FBI Crime Lab samples...
The Big Bang Theory Season 4, Episode 7
# Then nearly 14 billion years
AGO expansion started... Wait! #
The Big Bang Theory Season 11, Episode 10
No. I imagine if you were going to kill me,
you'd have done it a long time AGO.
The Big Bang Theory Season 1, Episode 10
That was five hours AGO.
The Big Bang Theory Season 11, Episode 16
How long AGO?
Westworld Season 2, Episode 9