SMSpam comes from XDA Developers and it is a free application that can send someone a certain Text Message repeatedly a certain amount of times.

The interface and concept is really easy, you need to either enter a recipient phone number or pick one from your contacts with the left soft key, enter a message in the box, select the amount of times to repeat the message and hit Send.

Warning 1: Extra charges may occur in case you don’t have a plan inlcuding free text messages.

Warning 2: You might physically damage recipient’s phone if you send way too many messages to it.