A letter.  I would avoid any kind of tangible gift.

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Letter, preferably hand-written on nice stationary, and bottle of wine.

A singing telegram obviously, duh.

Hookers and blow.

^ a little much, i was thinking a snuggle, or a new set of alternative facts

Alternative facts are good. In the land of alternative facts, I'm wildly successful in my dating life and many magazines have named me their most eligible bachelor. I've also won a Pritzker at 34.

You can give a letter.

Thank them and perhaps mention if you can return the favor.