In a unique and elaborate marriage proposal, Dan Fowlie used Twilio SMS to trigger a call from Zach Braff's voicemail, which was played over a custom contact created in Salesforce, convincing his girlfriend Kate Whalan to say yes. The plan involved Dan pretending to have no service while secretly sending a text to trigger the call. With only 20 lines of code, the proposal was executed flawlessly, making it a memorable and successful experience for both Dan and Kate.