Choose a number, press the short version button to see the beginning of the gif, see if anyone can guess what will happen next. Then press the long version button to see the full clip. See this page for more ESL web apps.
Please note: Some users have had an issue with slow picture loading speed. I think I’ve fixed it but meanwhile, here’s a link to the original version. It would be great if you could let me know in the comments if the speed issue is now resolved,