The meme presents a seemingly helpful herpetological identification guide, suggesting you examine a snake's anal plate scales to determine if it's venomous. Then comes the punchline from someone with actual survival instincts.
Field biologists have this ongoing joke about the disconnect between academic knowledge and practical application. Sure, I could tell you about subcaudal scale patterns while being injected with hemotoxins, or I could use my highly evolved bipedal locomotion to exit the situation.
The irony is that this identification method is somewhat legitimate, though I'd recommend binoculars rather than a close examination of reptilian posteriors. My dissertation didn't prepare me for snake butt analysis in the wild.