"You so can not!"

"I so can to!"

"Cannot!"

"Can to!"

"Prove it."

"No."

"Then I don't believe you."

"But I can!"

"Then prove it!"

"Fine."

"…"

"…"

"That's awesome!"

"I told you I could!"

"Baywatch, Robin, what the hell are you talking about?"

"Hey, beautiful! Check out what Robin can do!"

"How the heck do you do that?"

"I'm the Boy Wonder."

"Greetings Artemis, Robin, Kid Flash. What are you doing?"

"Hey Aqualad! Look at what Robin can do!"

"… All Atlanteans can do that."

"Awesome! Two people on our team can do it!"

"I bet Megan can do it!"

"Go ask her, Wally."

"Ask me what?"

"Hey Megan! I've got a really important question."

"What Wally?"

"Can you lick your elbow?"

I've only met one person who could do it, and they were a professional contortionist. I figured Robin could probably do it, and Khaldur has weird body proportions anyway, and Megan could probably just morph her tongue or something.