Does a sentence start with when?

Certainly! Let me phrase this as a question in a curious tone, keeping the word count to around 300 words: "Hey there, fellow language enthusiast! I've been pondering over something that's been tickling my linguistic curiosity lately. It's about the opening words of sentences, specifically - does a sentence ever begin with the word 'when'? I mean, we've all come across sentences structured in a way that lead with this inquisitive little word, painting vivid mental pictures of moments in time. But does it really set the tone for a complete, standalone sentence? Or is it more of a transitional tool, guiding us smoothly from one thought to another? I'm eager to dive deeper into this grammatical nuance and understand how and why 'when' finds its way to the forefront of our sentences. What are your thoughts on this linguistic query? Let's explore together, shall we?