Anyone who has caroused Lawrence's Massachusetts Street on a Saturday night has seen Mark Creamer with his "HONK FOR HEMP" signs and his phony three-dollar bills printed on paper made from the sacred herb. It doesn't matter how bad the weather is, he's out there stumping for the legalization of his favorite weed. He says he'll be out there every night until it's legalized. That's true dedication. But it's nothing compared with the devotion Creamer exhibited in 1989. That was the year he heard President George Bush vow to toughen the war on drugs. Disgusted, Creamer vowed to smoke pot until he got arrested as a martyr. He called 911, smoky joint in hand, imploring the cops to come down and get him. They declined. He decided to go down to the Lawrence police station and light up again. He practically had to beg the cops to lock him up. He served six months. What makes Creamer "the best," however, is how well he fits into his surroundings. Weekend nights in Lawrence already crackle with a dopey buzz. A hyped-up hemp activist in the middle of it seems, well, natural. In fact, the festivities just wouldn't be the same without him.