David Harbour was at the Encinitas Ale House in Encinitas, California, last weekend. He was filmed snatching a fan's hat inside the pub and running outside, asking the fan to catch him. According to reports from TMZ, they were not allowed to share the clip, but they described what was going on at the Encinitas Ale House on Saturday.According to TMZ's description of the video, they revealed that Harbour was seen entering the pub, and after a short while, he came out running with a white cap in his hand. He can be heard saying as he looked over his shoulder:"C'mon, dude, f***ing get me!"This was followed by a customer who was walking after the Stranger Things actor. The patron put their hands up and asked:"What the f**k did I do to you, dude?"A few seconds later, a group of people who seemed to know the customer came out of the pubhouse. A woman can also be heard saying:"Don't get into a fight!"The patron who lost his hat to David Harbour eventually returned to Encinitas Ale House with his hat. TMZ also revealed that no fight broke out between Harbour and the customer.More details about David Harbour's encounter with the fan in the pubTMZ spoke to other eyewitnesses who saw the entire encounter between David Harbour and the fan whose hat was snatched. They revealed that David walked by the bar with a friend, and the fan with the hat came up to the actor to speak to him. David's friend allegedly told the fan that they were there to meet up with some women, to which the actor said:"No, let's go to this guy's house."After this encounter, the sources shared that the fan was taken aback by the suggestion and went back inside the bar. A few minutes later, TMZ sources reported that David Harbour went inside the bar, took the man's hat, and ran outside with it.TMZ has reached out to David Harbour and his team, but has not gotten a reply so far.Additionally, a source with direct knowledge shared one possible reason why David acted the way he did. They said:"David has always been honest about managing his bipolar disorder. Wouldn't be surprised if that’s what he's dealing with here after working non-stop all year and having his personal life under public scrutiny. That would be stressful for anyone but even more so for someone who is bipolar."A few weeks ago, before the release of the final season of Stranger Things, rumors began that Millie Bobby Brown, his co-star, filed a lawsuit against the actor for sexual harassment and bullying. However, Millie herself and Shawn Levy have denied these claims and stated they were false.David Harbour was involved in a strange but harmless incident at a California pub where he took a fan's hat and ran outside. Eyewitnesses said the situation caused confusion but did not turn into a fight. One source believed that stress and personal challenges, involving his bipolar disorder, may have played a role in his unusual behavior.Also read: David Harbour talks about Stranger Things “taking archetypes” from ‘Star Wars’ and other pop culture lore