I have social anxiety and some kind of high-functioning AuDHD going on with me. That makes most social events weird and baffling to me to be fair.

But since you want stories here's a couple that are short and sweet if a bit loosey goosey on the social element:

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One time on a bus, late at night, a very drunk individual was encouraging conversation (if only because most of the other passengers weren't sure what he would do if we didn't respond). He was drinking something simultaneously black and cloudy out of a plastic bottle and offering people swigs. People didn't go that far into joining in, hence weird rather than actually scary. I may have said "no thanks I'm not sure what that is", and thankfully he took it well.

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Another time, as a kid with family on holiday somewhere. I forget exactly where. A shop in a high street with windows all covered with special offers and an opening time that was pretty soon. We think: "Why not?". A crowd had gathered by the opening time. The doors opened. The crowd flooded in with us fairly near the front.

The shop was completely empty save for a few guys in suits in formation at the back, and one by the door who'd opened them. Sleazy sales types, maybe religious types. It was hard to be sure, but clearly some kind of bait and switch. Thus began a wave of people trying to get out as the back of the crowd was still trying to get in.