Up here in Canada, I like to listen to a CBC radio show called Quirks and Quarks, which mainly involves interviewing scientists, often graduate students, from a wide range of fields about their work. In the last few years, I've noticed that the younger interviewees in particular preface almost every answer with "So ...", except for one, which starts with "That's a really good question ...". I assume this is part of some "presenting science to the media" guidelines graduate students are given, because it seems ubiquitous. I have never found it condescending or particularly annoying though, just a bit interesting. They generally seem enthusiasticabout their work and happy to explain it.