My attempt to log every movie that contains the line "it happens all the time". See the comments for when in the film it is said, and who says it to who.

Suggestions welcome. Ranked by year.

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Status: Next goal: Watch all films on the list to confirm them and note the details
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My "Random Topics" series:
Clever Girl/Boy
Films where Richard Gere plays a lawyer from Chicago
Films where Seth Green is cared for by a large animal
Films where someone burns something in the oven
Films with a significant snow globe
Films with characters named "Ben Stone"
Highest Grossing Film Released Each Year (U.S.A. Domestic)
It Happens All the Time
Movies where someone has their underwear unrealistically ripped from their pants