Two memories from the early days of democratising computers, teaching night courses:
1. A student who held the mouse in his right hand - and moved that hand with his left! Thought the mouse had to be on the right hand side of the screen - and he was lefthanded!
2. Student who reversed the mouse in his hand - when he moved it left, the pointer moved to the right! "I just find it easier that way." sez he. Never did figure that one out.