you can NOT flush the toilet in Fallout : New Vegas. you can drink from them though

You CAN flush the toilets in Stranger Things : 1984 (once)

you CAN flush the toilets in Duke Nukem 3D www.youtube.com/watch?v=XfGG...

you CAN flush the toilet in R.E.P.O. (and flush your friends) (submitted by @tiritiribobiri.bsky.social) www.youtube.com/watch?v=u-y8...