vincevincevince - 9:12 am on Jun 26, 2007 (gmt 0)

When I go to a theatre/theater and I am anticipating my friend arriving shortly, I may decide to 'bag' the seat next to me so that there will be a seat for him upon arrival and we can watch the play together.

On the other hand, I certainly wouldn't 'bag' the seat next to me and hold it when it became clear my friend wouldn't be arriving on time. It would be rude not to let someone else who arrived on time enjoy the show from a reasonable seat.