Here are the rules I go by.
1. Strangers never. (Unless there missing the bowl)
2. If I'm "droping some balast" Never Never Never.
3. Talking to a friend is OK
. but it can't be bathroom talk.
3a. There must be at least a 1 urnial gap between us.
4. Any comments like "Take a look at this dump" Requiers an ass kicking as soon as that person leaves the bathroom.
is short for Water Closet.