Just had this visitor collide with patio door. Seemed lifeless but slowly came round and appears undamaged, flew off after 10 mins.
(Pardon the Scottish Accent)
2013 photos & vids here
eff37 on Flickr
I think it's an optical illusion Wendy ;-)
Post edit.....I should have said its not meant to go in a point like the upper mandible but the photo does make it look more squared lol