In Anthony and Joe Russo's 2018 blockbuster "Avengers: Infinity War," Star-Lord (Chris Pratt) and Gamora (Zoe Saldana) share a romantic moment, knowing they are facing a series of difficult confrontations with the genocidal alien warlord Thanos (Josh Brolin). As Star-Lord and Gamora let out their emotions and tenderly kiss, they are interrupted by a crunching noise. Their friend Drax (Dave Bautista) is standing silently in the corner, very slowly snacking on a bag of zargnuts. Startled, Star-Lord asks Drax how long he had been there. Drax says he had been there for a full hour. He also explains that he had been practicing a new stealth technique that rendered him invisible, provided he stands perfectly still. 

Drax, of course, had not turned invisible, and had merely assumed he was because his friends failed to notice him. This is in character for Drax, who belongs to an alien species that has no concepts of metaphor,...