"Milkin' It" is an episode of the Happy Tree Friends Flash cartoon series.
Lifty and Shifty laugh at Lumpy, but then turn to find that the balloon is headed straight for a power line. A bird lands on the power line and is instantly vaporized, leading Lifty and Shifty to lighten the load of the balloon. They begin by throwing multiple heavy objects out of the balloon. Still on a direct course for the power line, Lifty begins milking the cow while Shifty pours the milk out of the balloon.
Eventually the cow is out of milk, but they are still headed for the power line. Lifty shrugs, unsure of what to do, but Shifty has a plan to clear the power line. Shifty cold heartedly throws Lifty out of the balloon, where he is impaled on a pine tree.
The balloon makes it over the power line, and Shifty begins jumping up and down in celebration. The basket he's jumping on breaks, however, causing Shifty to grab onto the cow's udders for dear life. Shifty sees that the balloon is headed for a fast-moving windmill, and because he is hanging below the basket, Shifty begins getting cut by the blades.
His intestines get caught on on of the blades, and after his spinal cord is torn by his refusal to let go of the cow, Shifty is spun around the windmill several times before he finally stops. The cow gets out of the balloon, which lands nearby, and begins eating some grass.