Had a bizarre one today.
A320, with only two rows of business.
2 young girls sit behind me in the second row and its obvious they are not used to being in front of the curtain, they also double check their passess as they obviously don't expect to be there.
Anyway, senior CC member calls them out of their seats to the galley and informs them that they are sitting in business, due to lack of seats in Y, but will only receive Y service.
I thought that that was distinctly odd -an invountary upgrade I can understand, but Y service in C seems a bit mean to say the least.