Photography geeks know that all lenses--fisheye, wide-angle, zoom--serve a unique purpose. But they can be expensive, so here's one that won't break the bank: the camera lens mug being sold by Photojojo.
For $24, you can hold your morning pick-me-up in what appears to be a 24-105mm Canon lens. The stainless steel lining will keep your beverage hot, and a lens cap cover will save you from any spillage.
We wish the lens cap was a sip top, but the makers of the camera lens coffee mug wanted to preserve its authenticity--it looks just like the real thing.
If you're too embarrassed to hand this uber-geeky coffee mug to your barista, there are other ways to justify the purchase. Photojojo suggests using it as a flower pot, ice cream cup, or snack container.
Alas, even the most geeky of you might not fork over $24 for a multitasking lens, so we have a cheaper, geekier option for you: go to a second-hand store, purchase an old lens, and make your own.