>>535526939
The car horn and engine purr noises that a happy and excited Spamton NEO emits are different from the distinct honk of an angry Spamton NEO. Even when play-fighting, the pitch and pattern differs from one of serious anger. Any basic Spamtologist worth their salt (route) knows this.
Caution and HP-restoring measures are advised when interacting with a SNEO, though, as even a well-meaning one may have powerful play attacks.