Brett Favre threw two second-half interceptions to tie George Blanda's career NFL record of 277, allowing the Chicago Bears to rally for a 27-20 victory at Lambeau Field Sunday night. But Favre was responsible for only two of the Packers' five turnovers against a banged-up but ball-hungry Bears team -- a surefire recipe for an upstart team to cough up its undefeated record. "We should have won the ballgame, but we made a lot of mistakes and they capitalized," Favre said. The Packers gave away a 10-point halftime lead, and Bears' quarterback Brian Griese threw the go-ahead touchdown to tight end Desmond Clark with 2:05 left. Favre came out blazing with 243 yards in the first half and the Packers led 17-7 at halftime despite two first-quarter fumbles by rookie receiver James Jones in Bears territory. "I thought we were going to put a lot of points on the board," Packers coach Mike McCarthy said. "To play the way we did in the first half and not finish it was very disappointing."