Eli Roth Marilyn Manson Always Gets Mistaken For ...

10/29/2011 8:45 AM PDT

Eli Roth recently went on a man-date with good friend Marilyn Manson ... and told our photog that the shock rocker always gets recognized by fans ... who don't quite know who he is.

Roth -- who is hosting a special this Sunday on The Discovery Channel called "How Evil Are You" -- also told us about the best Halloween costume he ever wore ... and the porn version he wore the year after.