So this happened a few years back when I was still doing my bachelor’s degree. The city I used to live in back then had an adventure pool kindish thing that was pretty cool but also too expensive for us students. Normally, that is, because one friend of mine once had a one-time job where she gave a way discount coupons of local establishment, one of them being said adventure pool.
Apparently, those coupons weren’t as asked for as anticipated though and at the end of the day she just took all or most of the remaining coupons for herself, including a lot of those pool coupons which allowed us to just pay a fraction of the ordinary prize when we showed up there after 6pm. The pool was open until 11pm on most days so we had the possibility to go there really cheap for up to five hours a lot and we started to take that opportunity up a lot and pretty soon we had a steady group of eight people that met up to go there (although we never were eight people, usually four to six at a time).