In the original Frankenstein movie, the line "Now I know what it feels like to be God!" followed by "It's alive! It's alive!" was censored by audio of a clap of thunder because it was considered blasphemous.
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The 1931 movie Frankenstein, sometimes called one of the worst interpretations of its subject matter in early film history, had been a massive success and is still held in high regard today. Still, it was 1931, and numerous things that people wouldn’t think twice about today were very touchy back then. As a result, there were some censorship issues. Massachusetts, Pennsylvania, and New York cut out the scene where Frankenstein’s monster drowns a little girl.
Additionally, the scene where Frankenstein learns his creature is alive was edited to be more appropriate. The line originally was “It’s alive! It’s alive! In the name of God! Now I know what it feels like to be God!" This was covered by the sound of thunder. Up to 32 scenes were requested to be cut in some states. Some of these scenes were not shown for decades.
The “Now I know what it feels like to be God” line wasn’t restored until 1999. The funny thing is that without that clap of thunder there to censor the line, the scene that has been parodied and referenced countless times in pop culture would be totally different, if notable at all.
(Source)