Horses, Just Big Dogs, Right?

My son and his family are going away for the weekend.  They have numerous dogs and cats and two horses.  I love dogs and I like cats but horses scare me to death.  I mean, really, have you seen how big they are?
Well, Steve and I are going to take care of them for the weekend.  And by take care of them I think I mean just throw the hay over the fence and let them have at it.  I'm too afraid to open the gate and go inside with them.  And besides, what if they overpower me and run out the gate?  I really don't think they will come back to my call of, "here horsey, horsey".
Now I have never had a traumatic experience concerning a horse, at least not that I can recall.  However it could have been so terrible that I simply blocked it from my memory.  I mean I even used to go horseback riding up at Shaver Lake.
I think, perhaps, the fear comes from the same place as my fear of roller coasters.  I used to love them but I am not real young anymore.  I wouldn't call myself old (even if others do) but I am more aware now of all the many ways someone can kick the bucket, so to speak.  And riding a roller coaster is just tempting fate.  Just like being too close to a 50 ton horse (do they come that big?).  I know now that there are a million things that could kill  me if I put myself in the wrong place at the wrong time and roller coasters and horses are just two of those dreaded things.

See, he's laughing at me.  He knows what he can do to me if he has a mind to.  Well, guess what Trigger, I'm not going to give you the chance!