Pay attention to what you're paying attention to. Be suspicious of your own suspicion.

Kyle, who lives near Wash Park in Denver, will tell you that now.

He was home from work one day recently when a pickup truck passed through the alley by his house. The driver was moving slowly and the windows were tinted. Kyle went inside and kept watching the truck. A few days later, he saw it again.

"When I saw it again the other day, my heart started racing. In my mind, he was waiting for me to come home," Kyle says. "I don't know what I thought he was doing exactly, but it was almost like everything I was seeing was corroborating this narrative in my head."

Kyle eventually decided to approach the truck and find out what the driver was doing in his neighborhood.

"I said, 'Are you waiting for someone? Is there something I can help you with.' And he said, 'No, what do you mean?' ... For a few seconds, everything he was saying was even more incriminating, until it caught up with me."

Kyle says then he realized the man was friendly and patient with his questions.

"He explained to me, 'I work at a restaurant down the street, I'm on my break. I take my breaks in my car sometimes, and I drive around the block, that's all.' And I noticed, yeah, you're dressed like you work in a restaurant, and that's why you were driving down the alley so slowly the other day, was you were just killing time."

"The reason this experience was meaning for me was it was just a chance to actually challenge an assumption ... and be proven wrong about it ... if given an opportunity, let your suspicion be proven wrong."

You can hear from Kyle, in his own words, in the video above, shot by photojournalist Tom Cole.