Here's an internal facing one: We send an automated greeting from the CEO as part of onboarding, but he actually sees and replies to every customer response, in both english and spanish, and forwards the more heartwarming ones on to the entire office.
It's pretty cool to get a handful of emails every day from actual customers who are very grateful for the work we do.
It also changed my opinion on the "canned CEO greeting". As someone who knows how those are built, they always struck me as annoying and disingenuous sales gimmicks, but our customers are significantly less tech savvy, and a huge number take the correspondence at face value and actually start a real conversation with the CEO.