“Who’s that jumping out the sky” may hold warm memories to those who witnessed WWE’s “Ruthless Aggression” era from 2002 through 2008, especially the man that lyric was written for, Rey Mysterio. Looking back on his former theme song, “619,” and his once iconic pop-up entrance, the Hall of Famer would love nothing more than to return to his former roots one last time before retirement.
“I had it in t
