Margarita on the big rocks anyone?

Apparently, using little bits of icebergs for ice cubes in your drinks is really fun...
The density of the ice is different so it stays frozen forever... you'll drink yourself silly and pass out on the couch before it melts... I'll have to try that sometimes.. maybe wrap a piece in an ice box and bring it back to Montreal...
now, the real question is... how do I go about to capture a baby iceberg?