I used to hitchhike in my early twenties, otherwise know as thimbing, hitching or autostopping. 
Really? Interesting! Where did you hitchhike to? Work? Or while you were on vacation?
I have hitched all the way to New York City. just stuck my thumb out but in Australia, it is more common to use a gesture where the index finger is pointed at the road.
Amazing! What a journey! That is neat! Are there any other gestures in other parts of the world?
There are some others like, in some places in Africa  the hand is held still with the palm facing upwards.
Wow! I was in South Africa a few months ago but I don't think I saw that. Has hitchhiking always existed?
I think since transportation existed. I do know someone who's family member used to give people rides on there back from place to place. Don't think he would have given me a free ride though. lol.
I see! Yeah I guess it might be kind of hard to hitchhike on horseback. Is hitchhiking illegal anywhere?