Ok, so the mathematicians among you will point out that they're not quite Mobius bagels, but they are interesting from a geometry and topological viewpoint. And tasty.
We're going to make two inter-locking half bagels, which look quite impressive, just from a plain old normal bagel. They key is cutting it in the right manner.
I first found how to do this on George Hart's website: http://www.georgehart.com/bagel/bagel.html
But I haven't seen an instructable on this yet, so I thought I'd share it, and bring a bit more maths to the breakfast table.
We will need:
1 Knife, fairly narrow, serrated kind is best, but others will work