I'm Certainly Not Stoned

Under bright lights, I have to squint. Especially fluorescents. Like these at Target:

Clerk to me: "You seem tired. "

Me to clerk: "It's the lights."

Clerk to my friend: "I hope he's not driving because I don't believe him that he's just tired."

My friend to clerk: "No, it's the lights."

Not the first time that this has happened. And probably not the last.