fun with science!
It may just be because I'm tired and cracked out, but I really want a Klein Stein. These people make Klein bottles of all shapes and sizes! They come calibrated and carry warning labels like:
WARNING! Acme constructs each Klein Bottle from genuine Baryonic matter. Do not allow your Acme Klein Bottle to come in contact with antimatter or unpredictable results may occur. Acme cannot guarantee the dimensionality of the result.
and
A Klein Bottle has zero volume, so we suggest that you do not use it as a personal flotation device. No user-serviceable parts inside.
Seriously, poke around the site. Every page is packed full of humor and science.
Acme Klein Bottle
Oh! And I nearly forgot! Knitted Klein bottle hats!
WARNING! Acme constructs each Klein Bottle from genuine Baryonic matter. Do not allow your Acme Klein Bottle to come in contact with antimatter or unpredictable results may occur. Acme cannot guarantee the dimensionality of the result.
and
A Klein Bottle has zero volume, so we suggest that you do not use it as a personal flotation device. No user-serviceable parts inside.
Seriously, poke around the site. Every page is packed full of humor and science.
Acme Klein Bottle
Oh! And I nearly forgot! Knitted Klein bottle hats!