Mine thinks that wormer is out to get her, and will stick her head up so high she hits it on the ceiling of the barn...
When she gets nervous she does a Flehmen response like this
http://www.sableislandhorse.com/Sable_Island_Horses_Stallion_Flehmen_Response_imgp7045.jpg
usually when I have to correct her on the ground or she is pawing/pacing/running circles around me when I lead her...
AND she does it when she makes herself nervous.. its a super goofy thing!!
IT does make her look like she is not so smart...
AND!!
She is known as the "bobble-head" horse, when she has to be the last horse in the group we ride with, she will bob her head and neck up and down.. AND then shimmy her
head side to side, as if something was bothering her ears or head...
At first I roached her mane, clipped her ears, hosed her down with fly spray... correcting her when she did it...
I finally gave up and do more constructive things like half halts, zig zags, and other things to keep her mind occupied.. People think she is... odd.
Kinda like her owner...we are a team that is for sure!!