It seems that Nick Jonas and John Stamos are very good friends and enjoy joking with each other a lot. These two celebrities started with jokes between them in the year 2018 and so far it is lasting. John started it all, when he showed some admiration for the «Jonas Brothers» band on several occasions, and from there, they started a nice friendship.
This started with a wink from one of his fans, and this started the jokes between the actor and the singer. These trolleys between them show that in this war has levels and levels.