The dark chemistry humor here is *chef's kiss*. Hydrofluoric acid (HF) is notoriously dangerous - it penetrates skin, dissolves glass, and destroys tissue while causing excruciating pain. Unlike other acids that burn immediately, HF can seep in without initial pain before causing catastrophic damage to bones and organs. The coffin scene perfectly captures what happens after a lab accident - you're basically preparing your own funeral. Chemistry lab veterans know that HF safety protocols are no joke - special gloves, face shields, and calcium gluconate antidote nearby at all times. SpongeBob's casual "okay, get in" is the grim punchline - there's no coming back from that spill!