I can't run the next pub quiz because I'm starting at Uni in just over a fortnight, but I would instruct the person who runs it:
- Make sure all of your images are stills from YouTube videos. It takes a lot of effort but it's about the only thing that can't be found by Googling
- Upload them all yourself. Obviously off-site URLs can be found easily
- Try to make all of the answers a variety of difficulties. Some easy, some obscure, some very difficult.
- Give each round 2 days minimum (the rest should be however long you take to score and prepare the posts).