“OK, Who Brought the Dog?” (Ghostbusters)

While actors Bill Murray, Dan Aykroyd, and Sigourney Weaver were the leading stars of the 1984 classic Ghostbusters, the crew’s main improviser was the hilarious Rick Moranis. He played the character of Louis Tully.

There’s a scene in Ghostbusters wherein Tully hosts a party for his clients, and Moranis extensively changed most of the lines on that scene. He modified the script and ad-libbed most of the lines, including the memorable “OK, who brought the dog?” It was a witty reference to the massive monster that crashed the entire party.