Funny enough, this has happened at least three times with Time Warner Cable (now Spectrum)'s Kids On Demand feature:
Up into the early 2010s, they used their own on-demand preview station that played in the preview window. Somehow, in 2010 in North Carolina, someone at TWC managed to switch the preview channel with an adult preview channel, causing softcore nudity and explicit discussion from Playboy to play in the corner of the screen for a few hours one morning. Of course there were complaints and people who managed to record/take pictures (they're NSFW so I won't link them here...easy to find, though).
When Nick Jr.'s "NickMom" block first started, Nick Jr. was the channel that played in the preview window. This led to complaints to parents looking for kids' shows on demand who heard the raunchy bits of NickMom in the background. They switched the preview window station to Boomerang just a few weeks later. This is one I remember seeing.
Time Warner also used to split up their Movies On Demand channel onto a separate Kids & Family station - I'm not sure if they do anymore, but I saw a recording on YouTube of the preview window on that station playing an ad for a pay-per-view special called Hot Sxxxxy Mxxxx and Their Sex Toys. A little less than wholesome family entertainment.
Up into the early 2010s, they used their own on-demand preview station that played in the preview window. Somehow, in 2010 in North Carolina, someone at TWC managed to switch the preview channel with an adult preview channel, causing softcore nudity and explicit discussion from Playboy to play in the corner of the screen for a few hours one morning. Of course there were complaints and people who managed to record/take pictures (they're NSFW so I won't link them here...easy to find, though).
When Nick Jr.'s "NickMom" block first started, Nick Jr. was the channel that played in the preview window. This led to complaints to parents looking for kids' shows on demand who heard the raunchy bits of NickMom in the background. They switched the preview window station to Boomerang just a few weeks later. This is one I remember seeing.
Time Warner also used to split up their Movies On Demand channel onto a separate Kids & Family station - I'm not sure if they do anymore, but I saw a recording on YouTube of the preview window on that station playing an ad for a pay-per-view special called Hot Sxxxxy Mxxxx and Their Sex Toys. A little less than wholesome family entertainment.