So this video is horrendously bad.
But it's worth looking at just for the comments.
"How did we ever live before this knowledge was handed down to us from on high?"
Why not use an actual cup or mug?
Normal glass jars will shatter when heated... and "Rubber bands are for wusses."
My personal favorite: "It's too bad you can't buy reusable coffee cups in stores." ROFL.