I ALWAYS have a deck or 2 or 5,6,7 on me at all times. I'm always playing with my cards. You can tell if someone is doing it for attention, but I honestly do it like a bad habit. Just playing with cards will get attention. I play with cards for my self, I do magic for everyone. If that doesn't work to well, talk to them. When I do night clubs, I talk to them. Make friends, if the magic comes up, I'll do a trick. It not, oh well. Don't do flashy stuff to do magic. Be an entertainer. Make them laugh and have a good time with them. Magic is just something I can do to entertain them, along with many other things.