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Harper photobombs wedding

Prime Minister Stephen Harper took a queue from President Obama's playbook and crashed an Ottawa wedding party's photo session. Photographer Laura Kelly quickly explains what was so funny in our favourite of the viral photos.

"Best part of the this whole interaction:
Harper: 'So, have you already done it?'
Pat (the groom): 'Nope, first time!'"

"Lol, Pat thought he was asking whether either of them had ever been married before, when really he was just asking if they had already had their wedding ceremony! Maybe you had to be there, it was hilarious." (Photo courtesy of Laura Kelly)

2012 Year in Review: Most viral photos

From the Harper wedding photobomb to the most retweeted photo ever, this slideshow takes a look at the most viral photos from 2012.