“Siri, drive to <regional grocery chain 20 minutes away>” → “Now driving to <regional grocery chain 2 hours away>.”
“Siri, send <name> a message on <popular messaging app>.” → One of _two_ responses (seems random): “Sorry, I can't do that while you're in the car” OR “What would you like to say to <name>?”
“Siri, play '<song in my Apple Music library by an artist I play every week>'.” → “Now playing <some song I've never heard of by an artist I've never played>.”
“Siri, remind me when I get home to <task>.” → “Sorry, I don't have your address.” (My contact information, with complete address, is in my Apple Contacts, and set as my card.)
The list goes on. It's actually become somewhat of a game for my wife whether Siri will actually complete a given request.