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Perry's post featured two side-by-side pictures of his preschooler son, whom he described as \"shy\" but also \"sweet and silly\" with a \"fun sense of humor.\" In the left photo, his son flashes a slightly strained smile -- but in the right photo, the young boy grins widely in a natural reaction caught on camera.

\"We always take pictures on the first day [of school] and we were in a bit of a hurry and having a hard time getting good pictures,\" Perry told \"Good Morning America.\" \"My son always has the funniest smile when he's trying too hard. I learned at some point that if I just yelled out 'POOP' and snapped the picture quick, it always worked out way better. In this case, it was a pretty dramatic comparison, so I thought I'd share it.\"

\"PHOTO:
Adam Perry
PHOTO: Adam Perry's son is pictured in an undated family photo.
>

It's a strategy others say they've employed themselves or been on the receiving end of. Some said they were curious to try it out on their own little ones.

\"Neat trick. Gonna try it!\" one Twitter user replied.

A different commenter confirmed that the trick \"always works\" for them.

\"My mom ALWAYS yelled out 'buttcrack' to make my sister and i laugh in pictures as kids. honestly she even did it at my wedding, still works,\" another Twitter user wrote in response.

\"PHOTO:
Adam Perry
PHOTO: Adam Perry's son is pictured in an undated family photo.
>

Perry, a children's book author, said he was surprised by how quickly his post took off and how much it had been shared. He said he hopes the viral post continues to inspire more smiles and laughs and helps other amateur parent photographers like himself.

\"I expected 5 to 10 people to like it. Then it kept climbing ... and climbing ... it's now at 297k likes. Then it went first page on Reddit and viral on Instagram and Facebook,\" Perry wrote in a message to \"GMA.\"

\"PHOTO:
Adam Perry
PHOTO: Adam Perry's son smiling next to a plate of food.
>

\"This post must have really resonated with people, and I've gotten tons of messages from people that are using this trick and getting great pictures of their kids, which to me, is the best part of all this,\" he added.

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