Mine!
public text v1 · immutableluke-jr@kazumichan:~$ cat /dev/dsp > a&
[1] 25888
luke-jr@kazumichan:~$ cat a>/dev/dsp
-bash: /dev/dsp: Device or resource busy
luke-jr@kazumichan:~$ cat /dev/dsp > a&
[1] 25888
luke-jr@kazumichan:~$ cat a>/dev/dsp
-bash: /dev/dsp: Device or resource busy