"Is that actually possible," Jack asks then shakes his head, "no wait don't tell me or I won't be able to stop thinking about trying it." He smiles. "So I won't say goodbye then, just see you soon Doc."
Other options:
no subject
"Is that actually possible," Jack asks then shakes his head, "no wait don't tell me or I won't be able to stop thinking about trying it." He smiles. "So I won't say goodbye then, just see you soon Doc."