On accident I put VLC media player on .67x speed and everything was going in slow-mo including their voices and at first I was like “Okay Jon Frakes, this is an interesting directing style but uh, cmon get it together” and I watched for a full 5 minutes like that before I realized that I am just incredibly stupid. 
I usually end up at 1.33 instead of 0.67, but seriously. It’ll take me awhile before I notice that it’s something I did...
I once watched an episode and a half of Scrubs in .67x before Chris came over and was like, “Uh, Erica…”