Okay, everyone, I've been reading this thread, and I'd like to answer some questions and respond to some statements that have been made.

*I* sneak into First Class every chance I get. As a matter of fact, I've never been asked to move by a flight attendant. The only downside is that sometimes First Class is full, and then I've got no room in coach for my bags. So I take care of that now by asking at the gate if First Class is full. If it is, I get on ASAP. Another thing is that I don't hang around the gate until they call final boarding. That would make me look suspicious. I stand a couple gates down and then it looks like I was almost late to my gate.

In a week I'll be trying it on an international flight to Seoul.

If you have questions about how it works, or why I've never been caught, fire away. I will say that if I was ever asked to move, I'd move imediately and quietly.