This Is How Two Sisters And A McDonald's McFlurry Went Viral On Vine
Lauren and Joanne Lavoie spoke to BuzzFeed News about how the clip with 40 million views almost didn't happen.
The sisters maintain that Joanne's reaction was genuine, and say they regularly record videos while in the car.

"Usually I just shout a random question and see what Joanne’s first reaction is," Lauren said. "She’s hilarious and her reactions are beyond funny.
"I don’t tap the brakes of the car ever, so yes, she was actually caught off-guard by the whole thing, much to the enjoyment of many."
She said the clip sat on her phone for around three days and she only decided to upload it after realising she hadn't posted anything for a while.
Within 24 hours it had almost 100,000 likes, and it later found its way on to the front page of Reddit and appeared on Tosh.0.
"I still can't believe that some of my favourite Viners and YouTubers have liked it," Lauren said. "I think even Kendall Jenner re-Vined it a while ago."
The sisters, from Regina, in the Canadian province of Saskatchewan, made Vines for a year prior to going viral.

Lauren, 23, now has almost 100,000 followers, while Joanne has over 60,000.
Joanne said using Vine had taught her it was OK to be spontaneous and unique.
"Lauren and I have received some difficult and insulting comments but with every bad comment we receive there are 10 more filled with love," she said, "which allowed us to push those awful things aside and pay attention to the people who really matter, the people who support us every day on this app.
"We can't thank them enough for putting up with our craziness on the internet but we love them with everything we have."