I post a word (any word) as though it were an acronym. For example:
D.O.G.
Then the person who posted next would have to make up what it stood for. For example:
Delegates Of Gamorr
Words that are actually acronyms are obviously not desirable (no OPECs or NASAs please), as well as long words. Anything more than six or seven letters gets a bit tedious ~_^
So, to begin
D.A.N.C.E.