Only once but it wasn't anything valuable or useful. I spent an hour taking a mouse apart several times and cleaning and lubricating the ball/roller mechanism as it was sticky. After about 5 attempts to get it working properly with no success, I got the rage, picked it up by the lead and smashed the stupid thing off the desk until it was sufficiently fragmented it I needed a vacuum cleaner to pick up the bits. Then I went to the shop and bought one of those sexy, new-fangled optical jobbies.