Tell him its ok, but then you take revenge on him, by killing some one clossed to him.
I don have a wife
Kill Him on the Spot
Make him kill himself
Sent some servent of your kill him
Accept, but Hide yourself, and Kill him silently, and Fast
Accept, but play arround a little.
Accept and kill him with no mercy
Deny the chalenge, but surrender yourself so you don't have to fight with him again, to avoid violence.
Have Sex With Him/Her, and the person who has the more orgasms and still can go for more, wins.
Find another way to duel, withought violence, because its to "barbaric" for you, to fight.
Super Memory, so you don't forget anything.
Memory loss, so people can be sorry for you and give you candy :D
Never Feel Physical Pain
Have muscles, but never have the need to work out
Be able to have sex lots of times in a row
Connect you sences, so you could taste what you see, hear what you touch... etc.
Stone and Plants