[header] How to make a mugger's wallet [title] Put cash in your mugger's wallet. [step] It should be enough that if a mugger thumbs through it, he won't suspect you're pulling one over on him. However, don't put in an amount that is too large, that you would regret losing to a mugger. 
Some people put a bigger bill in front of many smaller bills so that a hasty mugger thinks there's a lot of money in there. If possible, consider mixing fake money in with real bills.