Habit Conversion
When you normally blurt out your usual nonsense, but then some stupid thing happens that makes you forget your brain, so you can't say what you normally say. Most of the time, the stupid thing wasn't even that stupid.
I was about to say 'Hello, how are you?' but my dog peed on my shoe.
I was going to yell 'I’m the best at this!' but my mom walked in and said I had to do the dishes.
I was going to text 'Hey, what’s up?' but my phone died and I got distracted by a squirrel.