Handcuffs can be obtained at all the 'right' stores for about ten dollars. You may find yourself tempted to pick up the bolder, comfier, fuzzy cuffs -- go ahead. Buy any pair that suits you. For yourself, for a 'friend,' for those intimate bondage moments we all keep in our photo albums. However, since you will somewhat require something disposable, you will likely, personal flair aside, opt for the plainer, utilitarian, steel cuff. Best of all, they can be easily modified by removing the handy "escape" switch that disengages the lock. This purchase attended to, you likely now have a pocketful of change, and the pressing concerns of a life to live. Go with it. The only other thing you need right at the moment is patience.

Because you're a bounty hunter now.

The hip, urban lifestyle naturally involves buses. That's just the way. Frustrating and tedious as they might be, their purpose is to get you where you need to be; but now you can turn this embittering dependency into highly profitable adventure, and the only skill you need is a cool hatred of -- stupid people. Don't let your emotions get involved. You aren't on a crusade. All that compels you is the knowledge that on their heads a handsome sum rests. Beyond that, ride the bus as you normally would, and let nature take its course. Listen to your walkman, or read a fashionable magazine, and but remain detached from the human drama. Once in awhile, and you'll never know when (be vigilant, but be hip. This is a hobby for your spare time or while on your way to somewhere else. Visit your grandparents in the suburbs now and again, and all will be well), some highly "cool" person will take a pen, a marker, or a knife and -- with a glance-glance here and a glance-glance there -- start himself some vadalizin'. Slick back for a second... you're cool and congealed like Jell-o. Give him time to indulge in his art (because everyone hates buses, after all)... wait for it... wait for it... wait... wait... get his trust and...

SNICKITY CLICK!

Handcuff that sucker to one of the many convenient poles on the bus and stuff a mint in his mouth for his trouble.
You see, bus companies just like the one in the town where you live offer a rewards of up to $500 for the arrest of bus vandals, so scoot over to the driver and lay down the particulars.

Happy bounty hunting.