...or costumes or robots
or Darth Vader VOICE changers.
The Big Bang Theory Season 1, Episode 14
(IN STRAINED VOICE)
...cheese.
The Big Bang Theory Season 6, Episode 3
[IN NASALLY VOICE]
How is it my fault?
The Big Bang Theory Season 8, Episode 9
Hey, buddy. Good to hear your VOICE.
The Big Bang Theory Season 8, Episode 1
(IN GRUFF VOICE)
To the toilet! Is that okay with you?
The Big Bang Theory Season 4, Episode 23