to play / to have fun / to trifle with / toy / sth used for amusement / curio or antique (Taiwan pr. [wan4]) / to keep sth for entertainment
Martin Luther King asks Willy Walrus for the entrance fee for tonight's concert just inside the anthill's kitchen. Willy Walrus makes fun out of snatching away the coin again just when Martin is about to grab it. When he finally gives it to Martin Luther King, Martin finds out that it's just a toy chocolate coin.