When Adrian Beltre played for the Red Sox it was always funny to see his teammates mess with him by touching his head. He really hates that!
I had forgotten about all that until I saw this GIF of him out on the field when his Texas teammate Bill Andrus touched his head.
And here's a great site that has a whole bunch of GIF's with Beltre going a bit nuts. It is awesome!
UPDATE: I just came across this complition of the best moments of the Beltre – Andrus relationship. Makes me laugh!