Season’s Greedings level 1-21 is one of my favorites, specifically for the first shot. Our strategy is to fire Big Brother into the upper half of the stone plank. He will continue onward to pop the pig beyond and break a few presents in the bottom-right. But the fun part is watching the small pig get launched upward into the balloon-supported pig! (Sir Isaac Newton would be so proud.) Finish the level by launching the Yellow bird through the gap on the left side and by lofting the Blue bird into the TNT in the middle of the level. The score in the video is 61,210.
Note: The video below shows the Santa Hat glitch. This glitch has since been fixed and thus is no longer possible. The trigger was the Santa Hat atop the small pig on the left. To see which levels have the glitch, we have tagged them.