Fridays.
Today I'll be heading to the Copanies registry at Sheria house to conduct some biz.
While the place is full of anti corruption posters, bribes are solicited all the time. It goes like for name search:

"You can check after one week for the results, but since we can help each other why don't you buy lunch then maybe things can be faster,I'm only trying to help."

So the lunch is usually cash, varying amount depending with the level of help.