We had hornets having a party around one of the outside lights the other evening. They are HUGE....you cannot mistake them for a wasp. Also they are a lot more docile....only supposed to attack if you more or less tread on them. We just stood and watched them from no more that a yard away and they were fascinating to see. None of them showed any interest in us. I googled Hornet and found a clip on the BBC wildlife website that showed them to be pretty calm around humans.
However, I do admit to ushering one out of the house last night when we had small children spending the night....I say 'usher' I more or less batted it over the head with a large feather duster and flicked it out the back door....don't think it survived. 
Washed towels in the sun and now like sandpaper.

