The van that appears in the movie Super Mario Bros. show the real phone number and website from the plumbing company of Super Mario Bros.
If you call the US phone number (
´1-929-55-MARIO), you can hear a pre-recorded message from Luigi. You can also text this number to get on a mailing list, although you should pretend to have a “plumbing emergency”.
As if that wasn’t fun enough, the site smbplumbing.com is also operational (redirects to supermariobros-canalizadores.com in Spanish). It mimics a company website, with CAPTCHA, testimonials, images, chat and some job offers.