Demanding satisfaction

Somehow in the course of their many history conversations, K. has introduced Julia to the concept of duels, thus leading to the following exchange this morning.

J: I challenge you to a duel!
K: [after explaining that the person being challenged gets to choose the weapon] Tickle fingers at one pace.
J: [exasperated] No, daddy. That is not available. The weapons are swords, pistols and muskets.
K: OK then--cow patties. [Tells story of Abraham Lincoln being challenged to a duel, and selecting cow patties as the weapon.]