LOL that's what went through my head when i saw this at the market today lol Then i read the little info card they had posted and was even more interested. i googled the name when i got home and apparently shells are a popular pot for them.
Here's info from the website:
Dischidia pectinoides are also called ant plants. These scrambling epiphytes get their name from their large, hollow sacs that ants colonize. The plants benefit from carbon dioxide and 'fertilizer' produced by the ants, while the ants are provided with a convenient shelter. These ant plants produces clusters of bright pink flowers for most of the year. They come potted in large, hanging snail shells, and make attractive indoor plants.