A new documentary sheds light on the search for Marty McFly's red guitar from Back to the Future, which has been missing for 40 years.

Throughout Back to the Future 2 and 3, Marty McFly hates being called "chicken, but why wasn’t this plot point included in the first film?

NASHVILLE, Tenn. (AP) — Marty McFly grabbed a guitar in “Back to the Future” and rocked out with the band at a 1950s high school dance, helping him narrowly avoid blinking out of existence before time-traveling back to the 1980s. The guitar, in real life, wasn’t as lucky.