A coffeeshop (think "diner") next to my office just reopened after renovation. Said renovation entailed buying all new dishware - square and rounded triangle shapes, very modern and pretty. But their new coffee cups - well, it's just as well that I'll only use paper.
The rims are uneven, but that's more of a style thing. The real problem is their handles. Instead of the normal loop sticking straigt out of the side (points to icon), they're a solid right triangle (curvy outer edge, but close enough) that narrows towards the base of the cup. This is a problem all by itself - the solid but somewhat narrow handle is very hard to grasp (I played with one), and with my current thumb problems (why won't this darn tendonitis go away? It's been weeks! Cortisone shot didn't work, either), impossible.
But that's not the worst of it. See, that handle does not just stick straight out. Instead, it angles. To be precise, when the handle points to the right of the drinker, it angles away, making it marginally easier to lift.
When it points to the left of the drinker, it angles towards him or her. Which makes it even harder to lift.
In other words, the cup is handed.
So, no matter how pretty, that is one of the most unfriendly coffee cups I've ever seen. It's a good thing I only use paper.