Ice naturally makes cracks when it is frozen. Not large cracks, but cracks. Water seeps in through these cracks and freezes them. The crack expands due to the frozen water, or new ice. The cycle...
How do you break the ice with the girl/guy you like? Well, it would be really great if you could start by smiling and saying hi using their name and making eye contact when you see them. If you don't...
First of all, which cultures are you trying to break the ice among?
In some circumstances, it's very difficult to 'break the ice'... I'd go with finding similarities, whether it be dance, looks,...