My 2 wildest ones were over a decade ago.
The first was a woman who saw a new mum in the supermarket, the baby was crying and the mum was shopping, so op went and offered to carry the newborn baby around. Woman refused, then the ladies mum appeared and the lady and her mum dealt with the baby/kept shopping.
Well the op followed her around the shop, expressed concern about this woman to multiple staff members and then watched her leave.
Between the op and some enthusiastic posters they decided the best plan was to go to the supermarket, get the CCTV footage from the carpark, get the numberplate, track the woman down and report her to SS in case she has PND because she didn't want a stranger carrying her tiny newborn around.
I will never forget it, it was wild.
The other, I think it's in classics, was a thread about fashionistas at a taxi rank.
Op had just come back from France and instead of joining the taxi queue, elbowed her way to the front because she has kids. She was horrified that these fashionistas didn't immediately jump out of the way because she was more important. Hilarious.