Most of them in my case! However, my long-suffering spouse feel the nadir of my career (career: verb to be completely out of control) was the attempt by myself and a member of the West Midlands Constabulary (of notoriety)we'd just met over a Metaxa or two and who was similarily vocally-challenged to sing from a tattered songbook the taverna owner/guitarist had John Lennon's "Imagine". It not only emptied the taverna but sent the goats running back up the mountain.