Slug? What slug?

Playing with the kids this evening, I spotted a slug in the grass.

I called my son over and pointed it out with my toe.

Then I called my 6 year old daughter over. She looked at it too.

Finally I called my three year old over and pointed out the slug for her to see.

My son called me so I turned to see what he wanted. When I looked back, only a second or two later, I saw my youngest wiping off her foot.