This sound effect can be found on Series 4000 Hollywood Sound Effects Library, which was made by Sound Ideas. It's nearly identical to the sound effect, WHISTLE - PEA WHISTLE: MEDIUM BLOW, POLICE, which is found on The General Series 6000 Sound Effects Library.
Clean, Full Length and Unedited Link to the Sound Effect
- Elmo's World (Heard once in "Babies".)
- Mrs. Munger's Class (heard once in "Substitute Teacher" and "Fire Drill")
- Mario Kart Wii (Sampled in the Results music.)
- RWBY Chibi (Heard once in "Magic Show".)