Dads, do you like to give your children piggyback rides but don't find it creepy enough? How about an actual saddle? The kind you would put on a horse?
And there's no reason it only needs to go on dads. It can be used to evoke an uncomfortable feeling of misogyny just as well as it can evoke inappropriate images of adult-child contact.
Wandrwoman, clearly an experienced equestrian, has some practical tips: