The alien emoji is used to signal something quirky, weird, or offbeat—often with a playful nod to sci‑fi vibes or memes about being strange but amusing; it can also hint at a tongue‑in‑cheek “destroy all humans” energy in a joking context.
The exploding head emoji means mind = blown, used when something is totally shocking or amazing and you’re reacting with maximum astonishment.
Both emojis are used to amplify reactions and add a playful, expressive tone to casual conversations.
One leans into quirky, weird, or sci‑fi‑themed vibes, sometimes with a hint of mock threat, while the other is all about being astonished and mind‑blown.