Sunday Drivers

At a stopover in Batavia, New York State, many years ago, the Current Mrs Creel bought herself a set of wind chimes.  She said they hadn’t yet caught on in the Redland Road flats so we hung ours in our Aberdeenshire garden (with a view of the Ythan Valley).  I was away south on parole.  One draughty winter’s day they got mangled.  Today, twenty years later, I repaired them. 
A very warm and sunny start to the day, we inspected the policies.  By mid-day it was tipping down.  Two hours later warm sun.  It played havoc with my parasol.
Why do sheep pull straight out without indicating?