I said: "Shit!" ... And yes, I felt better.

[SomeStupidName]

The MythBusters proved it was correct.

MythBusters' Findings
 

• In their episode "No Pain, No Gain," MythBusters (S08E05), Adam and Jamie found that repeating swear words helped them endure the pain of the ice water for longer than when repeating neutral words. 
  

Key Takeaway
Swearing isn't just cathartic; it's a scientifically-backed method to temporarily increase your pain tolerance, and the MythBusters helped bring this finding to a wider audience. 

[Byrd]

The MythBusters proved it was correct.

But they didn't test it with people who don't swear... and with people who DO swear but had to come up with another word to use.

They just tested it with people who do "cuss" at some point, even if not on a frequent basis.  I noticed that at the time that the episode aired.

[SomeStupidName]

But they didn't test it with people who don't swear... and with people who DO swear but had to come up with another word to use.

They just tested it with people who do "cuss" at some point, even if not on a frequent basis.  I noticed that at the time that the episode aired.

 That's a fair point.