Yes the dialogue is custom - Imgflip

Undertale - Sans Boss Fight

Sans (Undertale) - Wikipedia

Sans goes 0 to 100 real quick : r/Undertale

UNDERTALE – Sans Boss Dialogue

Horrortale! - Sans Dialogue Sprites by SeptyDraws on DeviantArt

Oh it's Sans #undertale #undertalememe #undertaleau #sans #twitch #twi

Semi Frequent Undertale Facts on X: * There's a subplot in Undertale where Flowey constantly interacted with Papyrus when no one was around and eventually became friends with him, for all to

HS!Outerhorror by HorrorswapSans - Game Jolt

Normal Sans and Underswap Sans dialogue sprites by iGretz on DeviantArt

Undertale AU] Inverted Fate - Sans Fight by TheCakeOfTruth_ - Game