Warner Bros.' "Lethal Weapon" continued to knock 'em dead at the box office this past weekend. The Mel Gibson-Danny Glover action film did even better business its second weekend of release--a rare occurrence--with a $7.1 million take at 1,256 screens (compared with $6.8 million its first weekend at the same number of screens). Also, Touchstone's "Tin Men"--a comic tale of feuding aluminum-siding salesmen in 1963 Baltimore--appeared among the top draws this weekend, taking in $4 million at only 684 screens (a healthy $5,858 per-screen average). Two wildly different films dealing with evil doings--New Line's "Nightmare on Elm Street 3" and Tri-Star's "Angel Heart"--slipped a bit this past weekend: $5 million at 1,365 screens for "Nightmare" (compared with $6.7 million last weekend) and $2.7 million at 819 screens for "Angel Heart" (compared with $3.6 million). Figures courtesy of Exhibitor Relations Co.