OMG, this. Really, I don't get why people do that. It's not just awkward, it's gross. Other people's dirty stuff is gross.
Originally Posted by Rubber Biscuit

I've done it at places that you sit yourself especially when there are no tables open because it's packed. I just grab it and wait for them to clean it. Other wise you'll wait all day because someone else is gonna take it from you and sit at the dirty table.

Other than that Idky anyone would do it if there are obvious empty clean tables.