Corey Virgilio recorded the disgusting footage while he was at auditorium 16 to watch the film, "Bohemian Rhapsody" around 7 p.m. Sunday.
"We're sitting in the movie theater," Virgilio said. "I dropped my keys on the floor. I didn't want to ruin the movie for anybody, so I said, you know what, I'll just get it after the movie."
He said he pulled out his cellphone and got down on his hands and knees to look for his keys beneath the seats.
"As I look with my cellphone light to try to find my keys, I zoom in and I see something moving," Virgilio said. "As I zoom in closer and closer, I find easily seen with my eye, at least 15, 20 bugs."
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Virgilio said he immediately notified the movie theater manager and then posted footage of the bugs on Facebook.
He said something needs to be done about these kinds of filthy conditions.
"They need to rip out the carpet," he said. "Are these bugs coming from underneath the carpet? Is this something that's inside the seats? I mean I don't know where these bugs are coming from. I have no idea."
AMC Theatres released the following statement to Eyewitness News:
"A third-party pest-control expert was at the theatre this morning in response to the guest claim and video. The pest-control expert identified the insects as gnats and treated the affected area."
Experts with the San Bernardino County Department of Public Health believe the pests in the video are carpet beetles.
Regardless, health officials said they will come to the location to inspect the food serving and preparation areas.