Which phrase indicates disbelief or surprise in conversation?

The phrase that indicates disbelief or surprise in conversation is "I can't believe it." This expression is commonly used to convey shock or incredulity about something that has been said or heard. When someone uses this phrase, they are typically reacting to information that seems surprising or difficult to accept. It clearly communicates an emotional response to the situation or statement, making it a strong indicator of disbelief.

The other phrases primarily serve different communicative purposes. "Hear you!" suggests agreement or acknowledgment of what someone is saying, without necessarily expressing disbelief. "What do you mean?" indicates confusion or seeks clarification, and "Is that right?" can imply a degree of skepticism, but it is less emphatic than the expression of disbelief associated with "I can't believe it."