Have you ever had a big issue with a coworker?

@Moneyonmymind yes there was a porter that worked in our theatre department and he did not like me and made it clear like i say the feeling was mutual . he was on the lazy side so i made sure if i needed a job doing i would seek him from where ever he was skiving . i know he resented me giving him tasks too do and he would come into the theatre i was working snub me totally and ask one of the other staff what he had to say or needed too know