
It's interesting but isn't ventriloquism
by definition a solo ACTIVITY?
The Big Bang Theory Season 2, Episode 13

It's a laborious ACTIVITY
because I have to imagine what you need...
The Big Bang Theory Season 1, Episode 16

But what about a recreational ACTIVITY?
The Big Bang Theory Season 2, Episode 13

Now, try to increase
your alpha-wave ACTIVITY.
The Big Bang Theory Season 1, Episode 3

for our evening's ACTIVITY.
The Big Bang Theory Season 5, Episode 14