What's the most unreal or even surreal thing you've ever seen in a public place (incl shops)?

Usenet was a system of newsgroups based on an email-like system, which functioned in a similar way to subreddits, but long before the web was even invented. Even moreso than subreddits, each newsgroup developed its own very distinct culture, traditions and tone, and (as befits the source material, especially his earlier books) alt.fan.pratchett had an extremely silly, anarchic one with lots of bizarre memes that (like any meme) would make little sense to outsiders. For some reason long since lost to history it became a tradition to challenge anyone you had a lighter disagreement with to a duel, and the challenged party then had to accept and name the weapons to be used - the more ridiculous and impractical the better. Over time the humble lettuce became the favoured choice, because honestly there's not much in this world *less* dangerous than a head of lettuce. Anyway... in 1997 Clarecraft (a company who'd started making Discworld figurines) decided to hold an Discworld themed event a few days apart from an a.f.p meetup, so it was decided to combine the two into a weekend-long camping and activities event, and a whole bunch of a.f.pers camped out for the weekend in a field next to Clarecraft's location and also joined in and ran their own activities. Terry Pratchett was quite active on alt.fan.pratchett, but he wasn't originally intending to come to the event or meetup. Shortly before the start, however, his calendar freed up so he made a special first appearance, staying in a local hotel, signing books and meeting up with his friends from a.f.p. One of activities the a.f.p crew decided to run was *actual, real* lettuce-duelling, so someone turned up with a literal sack full of fresh heads of lettuce from a local farmer. The rules were quickly established (hold the lettuce in your dominant hand with your other hand behind your back, try to knock your opponent's lettuce out of their hand while not losing your own, any contact between lettuce and any part of your opponent's body above the elbow to result in one warning and then disqualification). No real prize was planned, but when pTerry found out about it he wanted to take part, so the event was quickly reformed into a knockout competition between all aspiring duellists, with the prize being the chance to duel pTerry himself. Sadly I think I was knocked out in the first or second round, but I was afforded the singular experience of watching my literary hero duel best an enthusiastic young duellist and satisfy his honour on the field of combat armed with an increasingly fragmented head of lettuce.