Sticky Starter Motor

Last night I went to start my car and on turning the car, there was just a ‘CLICK’ and then nothing. Remembering a Vauxhall Chevette I had which did this, I put the car into gear and rocked it backwards and forwards. The car then started fine.Has anyone else experienced a sticking starter motor? Do you think this was just a one-off or should I expect it to happen again if it’s happened once?Ian.