WYS:
Some Random Person: So will you be at my house tomorrow?
You: Probably, let me check if I have anything planned!
***
WYM:
Some Random Person: So will you be at my house tomorrow?
You: No, but I'm not going to tell you know. Instead I'll just wait until tomorrow and then text you with some made-up excuse, like my dog has cancer.
No dog deserves to fight cancer on their own.