In Mucinex’s latest commercial, the brand’s infamous mascot and comedic antagonist, the slimy, unmistakably green Mr. Mucus, finds himself in an unexpectedly undignified predicament: locked away inside the family dog’s cage, a humbling reversal of fortune for a character normally so intent on tormenting his human hosts.

Peering out from behind the bars, Mr. Mucus observes his intended victim reaching for a dose of Mucinex, and momentarily allows himself a flicker of smug reassurance, surely, he reasons, his reign of congestion will resume in a mere four hours, business as usual. But that fleeting comfort curdles into genuine despair the instant he registers the truth: it isn’t four hours he faces, but a punishing twelve, an eternity, by his reckoning, more than sufficient to expire from sheer, crushing boredom.

“Lock up your symptoms for the long term with new Mucin X 12-hour cold and fever. It’s a 12-hour sentence for symptoms and 12 hours of relief from fever, cough, body pain, headache, and excess mucus for you,” the voiceover is heard saying in the ad.

The gag serves as a clever, character-driven showcase for Mucinex 12HR Cold & Fever Multi-Symptom, an over-the-counter medication engineered to deliver up to twelve uninterrupted hours of relief from fever, body aches, headache, coughing, and chest congestion, all from a single dose.