I find him very useful,
as you will DISCOVER.
Vikings Season 1, Episode 3
But you didn't DISCOVER him.
You merely noticed he was here...
The Big Bang Theory Season 2, Episode 4
Oh, I heard about that.
Why didn't you DISCOVER it?
The Big Bang Theory Season 9, Episode 16
only to emerge
and DISCOVER his apartment
The Big Bang Theory Season 5, Episode 12
...DISCOVER our weaknesses,
and report back to your alien overlords.
The Big Bang Theory Season 3, Episode 15