President Obama's latest foray into the pop culture world was an appearance on the Jerry Seinfeld web series Comedians in Cars Getting Coffee."  A bizarre exchange between the comedian and the president dealt with the mental stability of world leaders. Reuters: Obama has "gotten off just enough funny lines to get on this show," Seinfeld said in the episode that hit the web late on Wednesday. The former star of the hit TV comedy series "Seinfeld" chose a silver blue 1963 Corvette Stingray for the ride with Obama, although for security reasons the pair had to be content with a few slow turns around the White House grounds and the coffee was drunk in a staff dining room. Amid the small talk, viewers learned that Obama blows off steam by cursing, that his underwear is all one brand and one color, that he shaves before he works out and that his guilty food pleasure is nachos. "How many world leaders, you think, are just...(Read Full Post)