"Uhhhhhhhhhhhhhhhhh..." Bart stammered, taken by surprise. Had his mask slipped? Was he wearing a name tag? How did this shiny guy know his name?
Bart cocked his head to one side at the explanation, hair all flopping in one direction and one eyebrow raising, "Okay Cable if you know me from the future, then you'll know I wasn't even born until the late thirtieth century-- 2980! So ha! Clearly you couldn't have met me if I hadn't been born yet!"
Wait, that didn't make any sense.
Having confused himself, Bart shoved a gloved hand back through his hair and considered the stranger again. "How do I know you're telling the truth?"