she’s left-handed

a punchline to a popular joke involving a man and his wife who asks him a purely hypothetical question, “if i died, would you remarry”. the punchline, for those of you who don’t get it, is explained at the very bottom of the example.
a young married couple are taking a nice stroll down a long and rather winding road. there was a long way till they got home and there was plenty of time to have a long drawn-out conversation, so the wife decided to ask her husband a question she had on her mind for a long time:
wife: “if i died, would you remarry.”
husband: “no, i love you too much to get married to a different woman.”
wife: “but you love being married, don’t you? so honestly. you’d get remarried wouldn’t you?”
husband: -sigh- “yeah, i guess i would get remarried eventually”
wife: “would you and your new wife live in our house?”
husband: “yeah, where else would we live”
wife: “would you take down all the pictures of me and you together?”
husband: “yeah, it would be very discourteous to her not to. i’d still keep the ones of me and you in my private drawer”
wife: “would you two sleep in our bedroom?”
husband: “yeah, where else would we sleep?”
wife: “would she use my golf clubs?”
husband: “no, she wouldn’t be able to. she’s left-handed!”
wife: …
husband: “sh-t!”
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explanation
him saying that she’s left-handed implies he already has someone to get remarried with, meaning he’s been cheating on his wife.