There's a mustard story about Alexander the Great as well. The day before a battle between the Great and King Darius of Babylon (had to look around a bit for his name, couldn't recall it), Darius sent Alexander a huge bag of sesame seed to symbolize the vastness of his army. Alexander responded by sending a small bag of mustard seeds, to indicate that although he had fewer men, his were strong and fierce.

And Alexander, being Great, then opened up his can of whup-ass and won the battle.