Probably the least maternal figure on this list, Marty McFly's mum Lorraine (Lea Thompson) starts out in the present looking a little weathered and worse for wear but is soon revealed to have been a stone fox back in the day as her son unfortunately learns when he accidentally travels back to 1955. Marty and Lorraine meet for the first time when he wakes up in his mother's bed, with her tending to him and mistaking his identity for that of his underwear's manufacturer. Needless to say she's infatuated with him, which makes things for Marty very awkward indeed as he attempts to both deter his mum's amorous advances and get his pipsqueak future dad George and Lorraine together. An unconventional mother by most standards - not a great many films have a love triangle between mother, father and son for reasons that should really be frighteningly obvious - Lea Thompson gives it her all and creates a great comic performance like none before with her lovestruck Lorraine agonising over why a nice boy like 'Calvin' doesn't want to be with a nice girl like her. Needless to say it all works out fine in the end, but the phrase 'give your mother a kiss' is likely to haunt Marty McFly until the end of his days...