REQUIRED CHECKBOX VALIDATION?

So we now how to enable a required field in a record, but how about making a requried checkbox in your Salesforce form? well it's simple and here is how to do it:

Field 1: Lookup field called : "Account" Field 2: Date field called "Date" Field 3: Date field called "Expected Completion Date" Field4: Checkbox called "Review"" AND(Review__c = FALSE, OR( NOT(ISBLANK(Account__c)), NOT(ISBLANK(Date__c)), NOT(ISBLANK(Expected_Completion__Date__c))))

and now, If the user enters data in to any one, any two, or all three fields, but does NOT check the box, an error will be thrown.