Do I need to see a psychiatrist?(seeing shutter island would help answer the question)?

I typically have no problems but I usually laugh at creepy movies or I when I am with certain friends that I am generally always happy with I laugh at horrible things I don't know if it is a nervous laugh or what because sometimes I can't stop. I saw shutter island and laughed at some of the creepy parts a little and was trying to not to chuckle because it was making me uncomfortable. For example I laughed at the part where the body said I'm dead" I thought it was ironic or just so out of the blue I had to laugh. I feel abd for laughing at this creepy things should I feel bad and do i need a psychiatrist?