I laugh to please them if it's somebody who is insecure already, I don't want to add to their insecurities. If it's someone who's pretty confident and fairly sociable who probably wouldn't take rejection as seriously, then I just smile....
well neither of those - i would probably just smile and kinda say, yea i've heard that before, i think that is probably less hurtful than the other two
but if i had to choose between those two - i wouldn't laugh an obviously fake laugh, so straight face for me
I say it depends on who your with.. if you know them, i wouldn't laugh.. and maybe even throw in a comment like "ha, so funny.. but no" lol.. like if it was a friend.. but if you don't.. i think a fake chuckle would be better.. cause the person would be able to tell that your trying not to be rude.. idk.. depends on the person..