ROFL, AWESOME post! I am the queen of making idiotic faces and I honestly have no idea why. I'm never scared when I'm jumping my Arab, and yet from the looks on my face, you'd swear I was the one convinced there were alligators beneath us! My two best ones made me SO angry, because they were being taken "professionally" by a friend and I totally ruined them!
I'm pretty sure it's my "I'm concentrating really hard!" face because she was jumping like a pro that day, so that's my only explanation.
This is when I first started jumping 4 years ago...I had pulled my horses mouth so my trainer "punished" me by making me jump on the buckle...ie basically no reins. Anyway...my funny face is that Im beet red. Like a whole different shade from my arms! Im pretty sure the temp was in the triple digits later that day.