He's a 7 year old male Siamese. I can't sit down ONCE without him appearing and cramming himself onto my lap. It's all very nice if I am watching tv or reading but I can't have him bugging me when I'm working or eating.
It's literally every time I sit down anywhere...he gets on. If he sees there's no room because of my laptop or book, he just sits on my chest or shoulder. If I push him off, he gets back on...over and bloody over again!
I sit down to eat and he thinks he can sit on me and look at/breathe on my bloody dinner! 
He only does this to me. He sits on DH in the evening but seems to think I'm his to take advantage of all day long!
Ive just spent 5 minutes shoving him off repeatedly as my laptop is on my knee and he's tapped me firmly with one claw and squeezed partly UNDER my laptop!