In a region stung by layoffs and the pullout of a major employer, comedian Jay Leno was good for a few laughs. The host of “The Tonight Show” put on a free stand-up performance Sunday for 4,000 people as part of his “Comedy Stimulus” tour. Leno, who also has performed free comedy concerts in the recession-wracked Detroit area, spent 75 minutes delivering jokes at the Roberts Center. He drew cheers from the crowd as he wrapped up the show, the first of two scheduled, saying he was just trying to get some laughs and cheer people up. Leno quickly launched into his stand-up routine, joking about President Barack Obama, marriage, movies, family and other topics at a machine-gun clip. On new medical terminology such as restless-leg syndrome: “My mother used to call that tapping my foot at the dinner table.” On the notion that obesity might be caused by a virus: “Can you call in fat to work?” On his hard-of-hearing parents watching television: “When you walk into my parents' living room, it's like a heavy
