Craig Smith, blogging on Freesound, relates the fascinating story of how he discovered and digitally preserved over 1,000 vintage sound recordings, including the infamous Wilhelm Scream.

Each original sound was on a roll of 35mm magnetic acetate film; these were transferred to audio tape in 1990. Craig explains what happened next:

“I got the SSE tapes from the USC Archive in 2016. It was immediately clear that these tapes had a big problem. They were recorded onto used Ampex tape from the 1980s. Tape manufacturers changed their formulations in the early ’80s, and it turned out these new tapes were very unstable. They started to display what became known as Sticky Shed Syndrome. (Google it.) When this happens, the glue that binds the magnetic oxide to the plastic base becomes sticky, and separates. This makes the tapes virtually unplayable. Fortunately, there’s a temporary fix. Tapes can be baked for several hours at a low temperature in an oven. So that’s what I did. Each tape was baked at 150ºF for four hours, then cooled for four hours. This made the tapes stable enough to transfer using my Nagra 4.2 full track recorder.”

Here’s the direct link to the web page with Man Eaten by Alligator, Screams: https://freesound.org/people/craigsmith/sounds/675810/

By the way, here are the movies listed in the compilation above:

0:15, 1:03 – The Venture Bros. (2004, 2008)
0:21 Aeon Flux (2005)
0:27 Star Wars I: The Phantom Menace (1999)
0:33 Team America: World Police (2004)
0:39 Star Wars IV: A New Hope (1977)
0:46 Spaceballs (1987)
0:54 Lethal Weapon 4 (1998)
1:09 Hellboy (2004)
1:18 Star Wars VI: Return of the Jedi (1983)
1:26 The Animatrix (2003)
1:33 Sin City (2005)
1:39 Batman Returns (1992)
1:46 Lord of the Rings: The Return of the King (2003)
1:52 Howard the Duck (1986)
1:59 Family Guy episode “North by North Quahog” (2005)
2:06 Raiders of the Lost Ark (1981)
2:14 Star Wars Holiday Special (1978)
2:22 King Kong (2005)
2:29 Toy Story (1995)
2:37 Indiana Jones and the Temple of Doom (1984)
2:43 Wallace and Gromit in Curse of the WereRabbit (2005)
2:51 Angel episode “The Cautionary Tale of Numero Cinco” (2003)
2:57, 3:16 Kill Bill, Vol. 1 (2003)
3:04 Lord of the Rings: The Two Towers (2002)
3:11 Angel episode “A New World” (2001)
3:23 Drawn Together (2004)

And, finally, here’s the original in context, in Distant Drums (1951):

My take: the original meme! I’ve used it too, in a pitch video of all things!