Like the joke of the guy returning to Boston after being away for years; asks his cab driver "Do you know where I can get scrod" and the driver says "Sure, but I've never heard that in the past perfect before!"
Another especially funny part of that joke for me is that this is set in Boston (which has a couple of important colleges) ... because someone once told me that a lot of post-graduates of that college I was attending were driving taxicabs in that city.