I like to think it started when the Obamas performed a low-class 'fist bump' after one of his debates or crowd speeches and got lionized for their 'relaxed' style over the stuffiness of previous presidents and spouses. Also known as decorum.
Yes . . . irrefutable proof that Barack Obama spearheaded a seditious conspiracy to unseat Trump. I wouldn't be surprised if the Obama's began looking for millionaire locations in non-extradition nations.