Any tips on teaching PATIENCE to your toddler/preschooler?

I just watched a video experiment on teaching kids patience. Ang ginawa nung dad sa toddler niya is nakipagdeal siya, binigyan niya yung toddler niya ng one piece of chocolate pero sinabi niya na if the toddler wont eat it for 5 minutes, he will get a reward and will receive 2 more chocolates. iniwan niya yung toddler sa kitchen with the 1 pc chocolate and monitored the toddler's behavior thru the cctv. :)