A feu (pronounced /ˈfjuːd/) (referred to in more extreme cases as a blood feud or vendetta) is a long-running argument or fight between parties—often, through guilt by association, groups of people, especially families or clans. Feuds tend to begin because one party (correctly or incorrectly) perceives itself to have been attacked, insulted or wronged by another. A long-running cycle of retaliation, often involving the original parties' family members and/or associates, then ensues. Feuds can last for generations.