Then from out of the dark came an awesome sound! Shouted Cowabunga! as they hit the ground.
6 seconds sound clip from the Teenage Mutant Ninja Turtles (1990) movie soundboard.
You can hear this line at 01:29:13 in the Blu-ray version of the movie.
Quote context
[...]
- Yeah, she was all alone with no friends, and no phone.
- Now this was beyond her worst dreams cause she was cornered by some wayward teens.
- Headed by Shredder they were anything but good. Misguided, unloved, they called them The Foot.
- They could terrorize and be angry youths, and they mugged the people. Who needed proof?
- Then from out of the dark came an awesome sound! Shouted Cowabunga! as they hit the ground.
- From the field of weeds the heroes rescued the flower cause they possessed...Turtle Power!
- Do you stand for what you believe in and find the strength to do what's right?
- Heroes on a half shell, they're on a mission.
- When there's a battle got the enemy wishin' that they stayed at home, instead of fightin'.
[...]