Sans the skeleton, in a blue hooded jacket with one eye glowing blue, faces a child in a striped jumper across a golden hall of pillars and stained-glass windows.

Original artwork, not a still

Sans

Do you wanna have a bad time?

— Undertale ‧ 2015

Behind the line

What it means

Our interpretation.

Sans spends the game as a lazy, pun-making skeleton, so a threat in his flat lowercase voice lands harder than any boss roar. The line promises the fight that follows, still the game's most famous, and it has since become a catchphrase for a friendly warning with teeth, often posted with a skull's grin. It plays on the old trick of the jokey sidekick turning out to be the real threat.

Context reviewed

In context

Spoilers for UndertaleShow the scene

In Undertale's Genocide Route, the player has killed their way through the Underground when Sans stops them in the Last Corridor, just before Asgore's castle. He remarks that they must have been busy, and when the player takes another step forward he laughs and asks whether they want to have a bad time. If they keep going he fights them, after first apologising to the late Toriel for breaking a promise. Earlier in the same route, past the bridge before Snowdin, he had already warned them against fighting Papyrus.

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Context reviewed

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