You need to run back home and tell whoever put you up to this that I'm not a complete idiot.
[His tone of voice is low and threatening, but once he's said what he has to say, he turns to leave. He's got better things to do than engaging in tasteless pranks.]
no subject
[His tone of voice is low and threatening, but once he's said what he has to say, he turns to leave. He's got better things to do than engaging in tasteless pranks.]