A weapon is a device used to cause harm to others. An example of this is a person who has had beans to eat. Also, this could include explosives.
Boom is a sound made by all weapons.
Many believe that beans cause a tooting sound. However, they cause a boom. get over it.
Cows and Weapons
Cows release methane every day, which could be considered a weapon (similar to the "Beans" Weapon).
toot toot goes the cow