drive-by texting

A text message sent by someone to try to stir things up, but when a response is made, no further messages are sent.
Similar to a drive-by shooting because after the assailant has disappeared, the victim is left riled up and frustrated.

Girl (out of the blue): "Haven't missed a beat have you?"

Guy: "What makes you say that?"

An hour passes with no response

Guy: "Drive-by texting?"