A thousand strands

I don't expect there are many patterns that instruct you to cast on with one thousand strands of yarn and then knit in stockinette, but it can be done. That's what a woman demonstrates in this video.

You read that right. She used a thousand strands of yarn per stitch.

It's a pretty impressive feat, even if it isn't practical, but just imagine having to weave in and hide all those ends.