Apostrophes!

I have to admit I am one of those people who do like good grammar and spelling. I am not going to suggest though that everything I write is never without an error here and there.
Part of my work this week was making an owl picture with a bit of an embroidered message on it.

It took quite a bit of time designing, cutting, sewing etc, so when I had finished it i displayed it in the shop window as I normally do with new products. 

 At 5 o'clock, while locking up the shop I glanced over in the window direction, there it was, like a ruler over my knuckles (just like at school!) my picture with a severe lack of an apostrophe!! How could I have been so silly! I just couldn't stop cringing at it, not sure if everybody else would have been that bothered , but I had to make sure that my first job the next day(after kettle on) was to get that apostrophe embroidered!