Putty Tat Trouble is a 1951 Warner Bros. Looney Tunes animated short directed by Friz Freleng.
It also marks the debut of Sylvester's recurring rival Sam Cat, who would next appear in 1956's Tweet and Sour.
The cartoon hits its climax when the cats chase the bird to a frozen pond on which is posted a sign warning of thin ice.
The cats slip and slide over and, while Sam reaches his paw in to see if he can find Tweety, they both become aware of a chipping sound.
They desperately oblige, in a bid for mercy; Tweety thanks them and completes the circle, causing the cats to fall into the frigid water.