Put this clip at the start of the warning beat, before Tom's reaction shot, then follow his expression with the dramatic dun dun dun for emphasis and save the vine boom sound for a second, bigger mistake later in the same edit.
Über diesen Sound
This is a 10-second voice clip that twists Sans's bad time warning into bad Tom, keeping the slow, threatening delivery but swapping the final word. It feels mock-serious and absurd, tense for a beat then funny when the name lands instead. It riffs on Sans from Undertale, where that warning precedes his notorious boss fight.