The phrase "Since when.." is often used informally to express surprise, disbelief, or curiosity about a new development or a change in someone's behavior. It usually prompts the listener to provide context or explain when a particular event or situation began. For example, if a friend suddenly takes up a new hobby, you might say, "Since when did you start doing that?" to express your surprise and invite details. In social media and digital conversations, "Since when.." can be a quick way to react to unexpected news or to highlight something that seems out of character or new. It’s common to see this phrase used as a hashtag or a catchy question to engage audiences and encourage discussion around surprising shifts or trends. From personal experience, I’ve found that using "Since when.." helps keep conversations light and interactive, especially when catching up with friends or noticing changes around me. It often opens a window for stories—whether about a new habit, an unexpected skill, or an opinion shift—that might not have come up otherwise. Additionally, using "Since when.." as a conversational tool reflects a genuine interest in others' lives, making interactions feel more personal and connected. This simple phrase encourages openness and provides an easy way to discover new sides of familiar people or situations.