The giant tiki statue on the Tiki Theater in GTA San Andreas is actually modeled after the hidden package collectibles from GTA: Vice City — a subtle nod most players never notice since the building is completely inaccessible.
Source: Tiki Theater — CC BY-SA
The stomach growling that launched a thousand Bigfoot hunts.
GTA: San Andreas
The green glow that tricked players into thinking they'd found nuclear waste
GTA: San Andreas
This tiny GTA town has TWO confirmed cult members hiding in plain sight.
GTA: San Andreas
The purple glow no developer ever explained
GTA: San Andreas
GTA's most paranoid NPC might be Clint Eastwood's iconic villain in disguise.
GTA: San Andreas
Rockstar hid a real Chupacabra in GTA IV — but it's not where you'd expect to find it.
GTA: San Andreas