Clicking the mug button on someones profile page will allow you to attempt to steal some cash and items from someone. A few factors are taken into account when attempting a mug:
1. Only cash in the victims hand can be stolen. Any money in the bank is safe.
2. A random amount of money is taken if you are successful. the more money they have on hand, the more you will steal with each successful attempt.
3. Random items can be stolen, more than one type can also be taken at a time.
4. Having a higher speed than your victim will help immensely but there is still a small chance that he will escape you. there is also a chance that if you have a lower speed than the victim you will still catch him.
5. It costs 10 nerve to mug a player.
6. If you have a lower speed than your opponent, there is a chance to Miraculously Mug them gaining cash and possible items with no experience gained.
7. You can be ambushed by your opponent during a mug and be retaliated against.
Whether being successful or not, you must wait 10 minutes if you want to mug that player again.