I discovered it by accident.
I came across it by accident.
I saw it by accident.
October 31, 2014
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From http://www.learnersdictionary.com/definition/walked
walk in on (someone or something) = to enter a room and interrupt (someone or something)
Examples:
"He walked in on me when I was getting dressed."
"She walked in on the meeting."
October 31, 2014
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