What are good ways to tease SHY girls and make them laugh?

The first 3 are just irritating. So don't do that. The other two: tickle her or gently bump them. But that's it. Teasing them about their weight they we will get all freaked out and start a diet or something or we will think that your just being mean. If you poke her that just gets plain out annoying. Also un tying her shoe laces is plain out not cool. That's a bit old school you know LOL? But yeah, like I said, the other 2 are good.