I made that mistake once when I was a teen. My father was not pleased one bit.

It's still reasonably common to see hot_new_movie.mp4.exe or have an encrypted mp4 with a install_this_codec.exe beside it.

Or even hot_new_song.mp3{lots_of_whitespace}.exe

Hidden file extension by default, so users are left wondering "hey why does this song end in .mp3"