Surprise your spouse with something unexpected. Out of nowhere.
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“I was thinking of you today (like every day) and I remembered that when we just got married you used to like to [walk along the water’s edge/ go to the bookstore/whatever]. Let’s plan for that sometime this week.”
“I know you like to put sprinkles on your cake, so I bought you some.”
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Make sure the surprise is about your spouse and not about you.