7. En Vogue - Batman Forever
90s R&B sensation En Vogue made a most odd cameo appearance in Batman Forever, during the scene in which Dick Grayson (Chris O'Donnell) steals the Batmobile and drives it around Gotham's dingy backstreets.
The musical quartet appear briefly as prostitutes loitering outside of a club when Robin pulls up.
After knocking on the door of the Batmobile and being met with the fresh-faced Dick, one of the group exclaims, "That's Batboy!", as they all break into laughter.
Viewed today, it's a relatively unobtrusive cameo, though at the time of the film's release, you'd need to have been living under a very large rock not to know who En Vogue were.
They probably deserved a more dignified cameo than this, but you can't knock their enthusiasm.