Kids say the darndest things, especially when caught red-handed using their little brother's naivety for personal amusement.

Adorable 3-year-old Lindsie Garvin got a bit carried away on July 18 with the Desitin diaper rash cream, when she strategically slathered it all over her little brother's face.

"They were playing in the bedroom," the children's mother, Kristie Garvin, of Kennewick, Wash., told GoodMorningAmerica.com. "They were being quiet and I checked in on them and they were being good, playing with these little dolls."

Taking advantage of the rare few minutes of solitude, Garvin walked away to let the kids keep playing while she hopped on the computer.

"My daughter shut the door and that should have been my first clue," said Garvin. "About five minutes goes by and I thought, 'You know what? I bet they're doing something in there because it got really, really quiet."

Garvin decided it was probably a good idea to check on the kids again, and opened the door to find her 21-month-old son, Bradley, covered from head to toe in thick, white, diaper rash cream, perfectly applied so as not to get any in his eyes.

"The smell hit me first," Garvin said. "My daughter goes, 'Surprise!' And I look down and see my son. I just stop in my tracks and get my camera, and what you see is what I filmed when I went back into the room."

"You are in huge trouble," Garvin says in the video. "Like super big, huge trouble."

Without missing a beat, little Lindsie innocently replies, "This pretended to be sun cream."

The family has been visiting lots of water parks lately so she thought it was the perfect excuse.

As for Bradley, he seems unfazed by the whole incident, sheepishly smiling for the camera when asked if he's alright.

The adorable viral moment has already gotten more than 107,000 views since being posted to YouTube on July 19.