I hate it when people start re-arranging the furniture in a bar where I'm working. Especially the people who push round tables together to make a larger table. Jesus wept, I barely made it through geometry the second time and I know better than to do that. Inevitably, you'll wind up with a situation where a bunch of drunks are trapped in a conglomeration of tables that looks something like a diagram of a complex protein chain. The waiter can only reach 5 or 6 people out of a group of 16 and everyone at the table is too self-absorbed, oblivious or drunk to make any effort to pass drinks down to the folks they've blocked in. Stuff gets spilled, other people can't get past the mega-table, and the waiter loses seating for half the bar because eight tables that could have sat four each have now become one table that seats 16. People wind up sitting farther away from each other than if they'd sat at the original tables, so they're not really "together" anyway, and the new arrangement makes it hell to wait on them or anyone else.
On the upside, one year when I was working as a cocktailer, I won a limbo contest because it was part of my job on a daily basis to literally bend over backwards for people.