Well, clearly MENTAL tasks are not enough.
The Big Bang Theory Season 10, Episode 22
...of arm wrestling with the MENTAL agility
of Tetris into the ultimate sport.
The Big Bang Theory Season 1, Episode 16
And with that MENTAL picture,
I think we're done for the evening.
The Big Bang Theory Season 4, Episode 4
Then as a MENTAL exercise,
I invite you to figure out...
The Big Bang Theory Season 4, Episode 22
who don't have MENTAL problems.
The Big Bang Theory Season 9, Episode 10