It really is, when you get down to it. Cal takes a sip of his coffee to give himself a few extra seconds to recover his powers of speech.

"Uh," is what he comes up with, before he continues. "They're paradoxes. They, uh, they're kind of - um." He shakes his head. Even if he could describe them, he's not actually sure they taste the same to everyone. "Just try one," he advises.

He's more than happy to talk about paradoxes, not least because he knows an evasive topic change when he hears one.

Or a drug-related rambling one. Either way.