Blink when it shouldn't

[sermis]

Came home and saw the right blinker flashing. First thought was someone messing with the truck. Checked and the turn signal leave was in the center so it shouldn't be blinking. Yes 3 leaver switch was one click right.
Any idea?

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[USAFSS-ColdWarrior]

Gremlins.

WIKI: GREMLINS

 

[Mogman]

Curious, what happens when you cycle the turn signal switch through its left, right and 4 way?
looks like simply a defective turn signal switch.

 

[papakb]

If you open up the turn signal switch you'll see a number of contacts that are actuated by a cam on the arm pivot. They can get bent and cause the problem you're seeing in which case you can bend them back with a pair of needlenose pliers. You might also find the switch got wet and has corroded internally. Open it up and post a picture if you do.