Blue Slug Bug

We were driving home from california as a family a couple months ago. My sister Lexi has 2 favorite things to do to bug every member, one-tickling. She gets a high from tickling EVERYONE. I'm not quite sure why but she loves it. And two-playing the slug bug color game. So we were driving and all of a sudden from the seat behind me, I start getting punched by a small fist. "Slug Bug! Slug Bug! What color?". So I'm throwing all the colors out there, "yellow, red, green, purple, blue". "Yep it was blue" she replies. "I didn't see a blue slug bug!" I said. And she said "it was a blue truck, I saw it was cool".