
♪ That all started
with a big BANG ♪
The Big Bang Theory Season 7, Episode 4

AMY: Previously on
The Big Bang Theory...
The Big Bang Theory Season 10, Episode 5

♪ That all started
with a big BANG ♪
The Big Bang Theory Season 5, Episode 10

♪ Bang! ♪
The Big Bang Theory Season 7, Episode 23

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The Big Bang Theory Season 5, Episode 14