Most of us have taken a tumble or two down the YouTube rabbit hole. We know how a seemingly innocuous, two-minute laughing baby video can turn into a two-hour time warp. The Found Footage Festival is like that — only way better. The bizarre assemblage of videos is curated by comedians Nick Prueher and Joe Pickett, whose credits include The Onion and the Late Show with David Letterman. The hosts spend all year searching through garage sales, thrift stores and Dumpsters to bring us delights such as 1997’s redundantly titled “How to Have Cybersex on the Internet,” among others. The 10th anniversary show screens at the Grey Eagle on Saturday, Feb. 1 at 8 p.m. $12. foundfootagefestival.com.