Place it just before a reaction shot of wide eyes or a staring pet, then follow the punchline with a snore sound for contrast. For a bigger escalation, open with a suspicious stare, let this clip carry the middle, and close with the snore sound to sell the failed attempt to stay awake.
About this sound
A male voice repeats the line about sleeping with one eye open in a drawn-out, half-serious tone, stretching the warning into a sleepy, uneven rhythm across about eight seconds. It feels both cautious and silly, like someone trying to stay alert while drifting off, and it turns ordinary suspicion into an exaggerated, instantly readable moment of paranoia.