I most definitely HAVE thought about it before...a lot. You didn't specifically mention 'deep fake', both audio and video. Using deepfake techniques videos may be produced which look real but are not. Want to see Humphrey Bogart in a commercial? It's been done. Want to see (name a politician) endorse something or someone that they definitely would NOT? It's possible.

At one time it was 'don't believe anything you hear and only half of what you see'. Soon, if not already, you can't believe your lying eyes either.