Florentina defender Facundo Roncaglia, helped by a blunder from Napoli goalkeeper Morgan De Sanctis, scored from just inside his own half in a 1-1 Serie A draw on Sunday.
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Uruguay stricker Edinson Cavani replied for Napoli with his 100th Serie A goal and 17th of the season to take his side level on points with Lazio in second place.
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Napoli and Lazio both have 43 points from 21 games, five behind Juventus who thumped Udinese 4-0 on Saturday.
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Giampaolo Pazzini scored twice, the second an exquisite in close control, to give AC Millan a 2-1 win over Bologna while bottom club Siena ended a run of six successive defeats by winning Sampdoria 1-0.