Bike stealing!!

People do wat all to steal bikes and the owners do wat all not to let them.
my friend recently lost his bike seat. someone jus flicked it. i dont understand how they do it...i mean how can they jus ride the bike with jus the seat?? very intelligent. i wanna see how they do that?? i too wanna get smart u know...
there are also ppl, who jus take their seats along with them, so that there will b no stealin of bikes. Bad bad stealer...no seat for you???!!! LOL...now what is it with just the wheel? am assumin some one stole the rest of the bike and sold it for parts. wat do ya think??? and there are some bikes which nobody wants to take...neways thas another story....i dont wanna get into that...