It's A Small World (Pilot Episode)

Wally and Beaver's desire to get a new bike causes them to fall prey to sneaky Frankie Bennett, he tells the brothers that the local dairy farm is holding a contest: the first person to bring in a thousand milk bottle caps will win a bicycle. However, when they go and collect their prize, they learn of Frankie's lie, and as a result, Ward takes pity on the boys and decides to buy them their own bicycle.