Examples:

• There's no rhyme or reason to this life.
• No rhyme or reason to it.
• You know, there's no rhyme or reason to your plan.
• Don't try to analyze it, there's no rhyme or reason!
• This story just says there's no rhyme or reason.
• There's an entire world out there with no rhyme or reason.
• There's an entire world out there with no rhyme or reason.
• There is no rhyme or reason to any of this stuff.
• There's no rhyme or reason to the dating game.
• There's no rhyme or reason to any of this.