I know it’s only an example, but hahahahahahahaha, ha. Start with something realistic if you do that. The worst thing you can do is to teach them you’re a bag of funny promises.
We were a management consultancy and trialling what they thought was cool new tech to use with other companies. ( This was a while ago, smart phones were newer and apps were still "cool" )
Well, they very quickly learned to never do that again. Even in a small company there were a lot of tensions unresolved between the lowest and highest rungs. It was a fairly formal hierarchical structure where the common worker didn't tend to ever interact with the big boss.
"Where's the pay rise we were promised last year?" was perhaps the mildest of the embarrassment, and it quickly devolved from there.
"Is... Is it me?"
"Oh God! No! No. How could it possibly be you? You got fired. Pied Piper's product is its stock."
Sounds like an extremely valid complain if such promiss was made last year.