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Here's what happened when 12 random people took turns drawing and describing, starting with the prompt "Underpants Sans (Google it)".
UNDERTALE UNDERPANTS Fangame
Pixilart - Underpants Flawey (power of sans) by FardyNyan
UNDERTALE UNDERPANTS Fangame
Underpants. (undertale parody) - Drawception
Underpants Sans (Google it) - Drawception
Underpants Sans (Google it) - Drawception
UNDERTALE UNDERPANTS Fangame
Sans In Briefs by ThePokemonTeller on DeviantArt
Underpants Sans Style Conversion with Undertale Sa by Abbysek on DeviantArt
UNDERTALE UNDERPANTS Fangame