Sometime in 2011 i remember watching cartoon network and seeing what i think was a bumper. It started with a mailbox opening and showing a spider with a cows head an utter and spots like a cow, all while having 8 legs like a spider. Around 5 years ago in 2016 i looked it up and found a photo of it which had a the video but the video was old so it didnt work,I have never found the name and the photo is gone.
The milk carton cow from Grim Adventures of Billy and Mandy; Wrath of the Spider queen. You're welcome. <3
Sadly that is not the bumper, the bumper has now been partially found as the cow spider itself is a gif by cyriak created about 10 years ago. Whats lost is the mailbox opening, the audio and any cartoon network logos.