Dirty Seat is a Teletubbies segment. It appeared in the episode Urban Birds and in the VHS Uh Oh! Messes and Muddles (Funny Day).
One day in Teletubbyland, it was time for tubby custard. The Teletubbies had their tubby custard at the table. But then, Dipsy had an accident. Dipsy spilled his tubby custard all over his tubby seat. Tinky-Winky, Laa-Laa and Po sat down in their tubby seats. But Dipsy didn't want to sit down. Dipsy didn't want to sit in the tubby custard. He and the others replied, "Eeewww!". Dipsy had nowhere to sit. So Laa-Laa let Dipsy sit in her tubby seat. Now Laa-Laa had nowhere to sit. Laa-Laa didn't want to sit in the tubby custard. She and the others went, "Eeewww!". So Po let Laa-Laa sit in her tubby seat. Now Po had nowhere to sit. Po didn't want to sit in the tubby custard. Of course, they all said, "Eeewww!". So Tinky-Winky let Po sit in his tubby seat. Now Tinky-Winky had nowhere to sit. Tinky-Winky didn't want to sit in the tubby custard. And they all went, "Eeewww!". Dipsy and Laa-Laa both wanted Tinky-Winky to sit in their tubby seats. But Tinky-Winky couldn't decide where to sit. So Po sat down on Dipsy's seat, and Tinky-Winky sat in Laa-Laa's seat. But then, Laa-Laa and Dipsy wanted to sit down. They look at the clean tubby seat. They both ran over to the seat, and tried to sit down. But they couldn't sit down. Po let Dipsy and Laa-Laa sit down on her seat. They went over and kept on bumping each other. Po sat down on the clean seat. Dipsy and Laa-Laa fell over from the seat. Dipsy got up and sat down on the seat. Laa-Laa had nowhere to sit again. She didn't want to sit in the tubby custard. They all replied, "Eeewww!". So she sang a song, and the others sang along. And then, the Noo-Noo came by and cleaned up the tubby custard. Now Laa-Laa had somewhere to sit. All the Teletubbies sat down, but in the wrong places. So they all changed places. Now everybody sat down in the right places. Then it was time to eat tubby custard. The Teletubbies were about to eat, when the Magic Windmill spins. So the Teletubbies went out and the Magic Windmill stopped spinning with the magic event tune. And it was time for Tubby Bye-Bye.
In the VHS, the stop spinning animation was replaced with the TV transmission segement.