Sheldon has just spent a lot of time trying to apologize to everyone so that he could go to Vegas. The problem is, he manages to offend Emily in the process and he does so in a typical Sheldon manner. That is when he shows up when they least expect it, jumping out of the bathroom on the tour bus that they are taking to Vegas. His aim is to offer a real apology to Emily and gain her acceptance.
As it turns out, Sheldon is able to give the perfect apology to Emily and it works very well. It is then that he gives a gesture to everyone, stepping off the bus and providing them the opportunity to go to Vegas without him. The problem is, everybody feel so bad about him getting off of the bus that they turn it around and go pick him up.
If there is one thing that we’ve come to appreciate about The Big Bang Theory over the years, it’s the fact that things continue to change. This is just one example, but it is one that will certainly put a smile on your face.