Looking for Leftovers in all the wrong places

Cornelis Dusart, was able to capture the sheer delight of this gentlemen discovering a bit of leftover "somethingorother" in a ceramic pitcher in this seventeenth century painting.

Dusart was not only a painter, because he, like Rembrandt,  was a master at etching.  Check out his charming etching of two peasants practicing a little PDA (public display of affection) in this 1685 print entitled "The Peasant Couple Kissing Each Other."

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 Hmm, is there such a thing as a leftover kiss?  How do you store them - and is there an

expiration date?  Let me know.