asking someone to speak backwards giving the ultimatereverse card effect while saying that. This would make the person shut up. If not, ask the person to search this on the urban dictionary.
when bored, friends will start to text backwards. this prevents boredom and can be a great conversation piece. although it is difficult, and easy to mess up. its fun all the same
Jen: Hey, whats up?
Ben: Nothing.
Jen: why dont we try gnitxet sdrawkcab?
Ben: what?
Jen: llew eruoy hcus a gnirob nosrep, i thguoht i dluow ecips ti pu!