He was running around on my keyboard, so I thought I'd let him say hello to everyone. At one point, he brought up the Post Options dialogue box (_I_ didn't even know the F5 key does that...).
We played Attack of the Mouse Cursor for a while. Guai-Guai was standing in front of my monitor. I made the mouse cursor bounce along the bottom of my monitor and buzz around the general area of his head. He went totally psycho, ran after it and kept trying to kill it. =D