The Stag Convergence
The Big Bang Theory Season 5 Episode 22 (04/26/12)
It's time for Howard's bachelor party! Instead of a wild and crazy party with strippers, his party is a mild affair with food and drinks until the speeches. Raj outs some of Howard's secrets, including that he had sex with his cousin and had a three-way with Raj. Wil Wheaton put the video of this confession on YouTube.
Bernadette sees the video and is upset that Howard lied to her about his past. Is the wedding going to be called off? Howard shows up and gives a heartfelt message for Bernadette to Penny. He declares that he is a changed man because of Bernadette. She hears his message and they make up.