A childhood belief about general

My brother and I love to suck my mother in, because its so reliably easy. Even my sister would get her, like when she got her to believe that laboratory monkeys were being released to good homes as the experiments were finished ---these monkeys were of course fully trained and could dress themselves and sit at the table for meals, some could even talk. (Dog part coming up.)Finding it hard to give this up, I fell into tricking my future wife too (I'm getting therapy). For example we lived in England for a bit, and they had signs around saying "KEEP DOG ON LEAD". She asked what that meant (they use the word 'leash' in her country). I carefully explained how lead was used as a nutritional supplement to keep dogs calm in England, much safer in parks, don't you know. This worked quite well for some months until she twigged. That was 19 years ago, yet she still has this indignation about it.