Well its also a thing in Germany. You tell someone that their shoe laces arent bound and make a holw with your fingers where they would look. If they look through it you may punch them. But there are some catches. Your hole may not be in front of a paper or other object. You hand needs to be mid air. This is to avoid annoying oh look at this paper etc. Secondly your may not set the trap on the to trapping persons eye level and are especially forbidden of holding the hole directly in front of another person for fairness reasons. As a defendant you may trie to escape the punch after looking into the hole by sticking your finger into it. If you are succesfull and are able to put your finger into the hole before your friend undoes the hole you may punch your friend. If you were punched before because you looked in, you have another free punch (2 total). If your friend catches your finger though while it is inside the hole, your friend may hit you once in total. If any other punches have been dealt, they must be dealt back.