Thanks to a fickle rookie quarterback and a suspect secondary, the Jets officially entered the pantheon of the world’s greatest mysteries Sunday alongside the Bermuda Triangle, Jack the Ripper, the Lost City of Atlantis and, of course, women. With visions of the playoffs dancing in its head, Rex Ryan’s team slipped into belated Halloween costumes in western New York. They dressed up as paper tigers during a humiliating 37-14 loss to the Bills that raised concerns whether they are a legitimate playoff team. “We’re not going to be a playoff team until they say we’re in the playoffs,” right guard Willie Colon said. “Right now, we just lost to the f--- Buffalo Bills.” The Jets became the first team in NFL history to alternate wins and losses for the first 10 games of a season, a maddening see-saw that brought Ryan’s 5-5 team back to the pack for the final wild-card spot with six games to go. Scientists can’t explain it. “It’s a broken record,” Colon said. Ryan and his coaching staff have done a masterful job of overachieving, but Geno Smith simply might not be ready to ignite a playoff push on a team that repeatedly praises its bounce-back ability, but hasn’t managed to actually have a winning streak. The rookie was “awful,” as he rightfully put it, with his second four-turnover nightmare of the season. For all the promise that Smith has shown in his first 10 games — he has four game-winning drives — he’s looked every bit like a work in progress since his thrilling come-from-behind road win over the Falcons in prime time last month. Smith has thrown just one touchdown with nine turnovers (eight interceptions) with a 51.8% completion rate since that night in Atlanta.