WHAT IF THE EARTH EXPLODES?

I'm checking out at Goodwill and playing "what if?"
I want to talk to the girl scanning my items.
But, what if she thinks I'm an idiot?
What if she gets "turned off?"
What if I do more harm than good?
Besides, there's a guy in line behind me. Conversation would delay his checkout.
What if HE thinks I'm an idiot...gets turned off...you know the drill.
Help me Jesus! If I try and share the Gospel...what if chaos erupts, people are screaming and running for the doors...the guy behind me is firing a...