"There's a non-zero chance of getting stranded between dimensions and losing a year of your life," or maybe "evil aliens might blow up your house and try to kill your family!" But no, it's all about how you get a chance to work with Batman or Superman...

[ Ugh. Thankfully that stuff is far enough back that he can laugh about it. ]

No one tells you that local car salesman will want you to do a spot for their dealership, either.