extraordinary off-screen persona that have transformed Cage into an unwitting walking, talking (and sometimes yelling) meme.The memeification of Cage has in and of itself spurred a Cage-ification of pop culture, and that’s the foundation for Lionsgate’s “The Unbearable Weight of Massive Talent,” which stars Cage as his greatest character yet — himself. Rather, a fictionalized, off-the-wall and sometimes CGI-produced young version of himself. The action-comedy spoof, from director-writer Tom Gormican and executive producer Kevin Etten (who previously collaborated on the short-lived Fox sitcom “Ghosted”), sees Cage — on the edge of bankruptcy — accept a $1 million offer to attend an über-wealthy super-fan’s (Pedro Pascal) birthday party at his agent’s behest (Neil Patrick Harris).