If you wait until you think of one that will be cool forever, you'll never get one or you'll be wrong. Life is change if nothing else.
Get one that you think is cool now and it will always remind you of where you "were at" when you got it and the circumstances that prompted it. That works, as long as it's not a swastika on your forehead or something stupid like that. Getting something that's in a place that's covered when you're in a suit for job interviews and funerals, can't hurt.
You'll probably discover the difference between people with tattoos and people without tattoos. People with tattoos, don't care that people without tattoos don't have one.
