Year: 2010
Event: Worldwide Developer's Conference 

Truth be told, after Jobs introduced the highly anticipated iPhone 4, many—if not all—viewers were pretty much satisfied with the keynote speech. A new high-speed handset featuring an extremely high-res screen, running an all-new operating system was all anyone could have asked for from Apple. But, like he always does at that time, Steve left the audience with one more gem before they bounced: FaceTime. Apple's video calling system was heavily rumored about thanks to early reports of the iPhone 4 having front- and rear-facing cameras. It became official when Steve made the first-ever FaceTime call to head designer Jonathan Ives. Even more remarkable was that the wi-fi based service actually worked! If you've been watching Apple keynotes over the years, you'd know how impressive that is...