"I happened upon this video" or "I happened on this video" I read the latter in a blog post, but I've heard the former mostly. Which is right?
closed as off-topic by ColleenV♦, CowperKettle, user3169, CRABOLO, Dinusha Nov 24 '14 at 3:10
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You risk sounding dated/stilted/starchy/formal if you use the phrasal verb happen upon (or more often, chance upon) in many spoken contexts today.
come across (phrasal verbs: defn 2.1) - meet or find by chance
Some people say them both but you could best write it as: "I happened to discover this video".