The best strategy for Danger Above level 8-3 is to lob a Yellow bird, speeding through the two horizontal wooden planks above the beachballs. The stone columns will topple to the right, and with a little luck, they can trigger the TNT at the bottom of the level. The score in the video below is 133,900.
Fun fact: This level was originally designed by a 5-year-old Texan named Ethan, and thus Rovio included his name in the sky. Read more in the comments section.