Your wife told you a little lie as a joke, but immediately told you the truth. She said that she hadn't paid the mortgage, when she actually had. You're telling your wife's sister about this the next day, and you say:
She played a little trick on me yesterday.
When you "play a trick on" someone, it means that you tell them a funny lie, or do something to surprise them.
This isn't usually done in a mean or harmful way. Usually "tricks" are done to make everyone laugh, including the person who is being tricked. But you can also use the phrase "play a trick on ___" to talk about mean or hurtful tricks.
In American culture, people who are good friends or family sometimes play tricks on each other, although there are certain people who don't do this and don't like being tricked.
A "little" trick is one that wasn't harmful or mean.
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