
Although...
The Big Bang Theory Season 7, Episode 10

Although we distinctly heard
his office window open and shut.
The Big Bang Theory Season 5, Episode 17

Although, if you wanted
to talk to one of them,
The Big Bang Theory Season 7, Episode 1

Although, it
might've been
The Big Bang Theory Season 7, Episode 22

Although,
based on your story,
The Big Bang Theory Season 7, Episode 18