it's not hard to find a best-seller on thank yous because who doesn't like to be told thank you. you'll remember the former u.s. president barack obama would say "thanks obama." his successor donald trump also a big fan of gratitude but on some interesting topics like the senator john mccain's funeral and oil prices and even more. our jeanne moos has this. >> reporter: here's a sound bite with a little too much bite. that jaw dropper about john mccain. >> i gave him the kind of funeral that he wanted. i don't care about this. i didn't get thank you. that's okay. >> reporter: mccain's sense of humor was such that he'd probably appreciate the late night roasting president trump got. >> apparently, mccain is just one of many dead people who never thanked trump. i never heard from lincoln. >> hallmark has a very limited offering of "thank you for the funeral" cards. >> reporter: how about thank you for those oil prices?