Why?

Today when we got in the van to take my daughter to the commissary, where she works, she turned around and looked at my 4 year old and said "you're not riding your bike so why are you wearing your helmet?" I said "Oh, he wears it sometimes." Vanessa said "You're not going in are you?" "Of course I'm going in, why?" "Because he is wearing his bike helmet." "I know, I just told you sometimes he does that." "Why?" "What do you mean why?" "Why does he wear his helmet to the store sometimes?" "Maybe he thinks he is going to fall out of the basket onto his head. You know shopping carts aren't safe. Remember the time I ran over your finger with one at Ft. Sill?" "Yes, so you see it wouldn't of mattered if I was wearing a helmet." "Well maybe you should of been wearing boxing gloves." We pulled up to the store and she said to let her out in front. "Why, I told you I'm going in so I'm going to park." She said "that's ok, I don't want to walk in with the weird kid wearing his bicycle helmet in the shopping cart." "Just tell them your weird mom thinks it's not safe to go shopping without your safety equipment." "just let me out in front." So Vanessa went into work and 5 minutes later we were passing her register when my 4 year old, wearing his helmet, called out loudly "hi Vanessa." Of course she waved because even though she didn't want anyone to know it was her weird brother wearing the helmet it would be worse if the kid with the helmet yelled "hi Vanessa" 25 times just to get her attention.