I have fun with every Klein bottle order. When someone buys a Klein bottle, I celebrate by walking through our backyard garden, looking for new blossoms. I usually take a few photos and send these to my customer-friend.
This micro business puts me in touch with fascinating people (I've met kids in elementary school, grad students, Nobel laureates, even a delightful nut who made a 4-meter tall wooden Klein bottle for Burning Man). The kind of people you find here on Hacker News.
PS - with reference to your HN identity -- from my ham radio days of long ago, I once experimentally determined that a 1/2 watt, 600 ohm Ohmite resistor would burn up when inserted in a 120V outlet. Hmmm: 24 watts into a half-watt resistor? Yep, filled the room with that acrid smell... Don't try this at home.