I swear that this is true .. I have a witness that will back me up on this.
I was at one of the shows in the South West of England - very nice location, the resident club had bought their own field and had laid a nice runway - they had a club house etc (which is pretty rare over here - most clubs rent their field and generally have no facilities at all).
Anyway - part of the display was a chap flying a rather big 3-d model. However he mis-judged the landing and the field completely - eventually putting the model down in an adjacent field full of cows - I'm not sure but I think that he managed to hit one of the poor animals square in the back end. The startled animal took off for all its worth - followed by the all the others. They ran for something like 50-100 yards, put the bakes on and stopped dead in their tracks. They then all turned around and took a long hard look, before they one by one, walked back to where the undamaged plane was sitting. First they started sniffing at it - then all of a sudden they started stamping up and down on it - they had a real fun time. By the time the pilot got to the aircraft - it was well and truly smashed to bits.
There must be a moral to this story - but I can't think of one just yet!
I take it that the squirrel you hit was the North American Grey variety? We have a major problem over here - the grey squirrel has virtually wiped out our own cute red squirrel population. The grey's are now classified as vermin and can be shot on sight - so if you manage to perfect the taking-out of these furry bundles of fun with your avistar - then come over to the UK and have some real sport!