A good ice breaker gets a reply every time. The trick is being specific and easy to answer.
"Pineapple on pizza — yes or crime?" "Coffee or tea person?" "What's your controversial food opinion?"
"What's the last thing that genuinely surprised you?" "If today had a title, what would it be?"
"What's a random skill you have?" "What's the best thing you've watched or read lately?" People love answering these.
Match with a stranger, drop one of these, and watch the conversation take off.