"Come out and fight!" the knight called.
"Very well," the dragon replied. "As the challenged party, I get to choose weapons. I choose pistols."
"What? I have a lance and horse!"
"I don't. Here is a matched set, pick one."
"Those are cannons!"
"Tomayto tomahto. Pick, or forfeit the challenge."
@MicroSFF
I liked the confusion between jousting and battling. No knight would ride a horse into battle holding a lance. Maybe a spear, though, for a single throw, then get the sword out. In a very convoluted scenario.