Every company must have a logo with four colors -- some variant of red-green-blue-yellow. It should also fit into a square, and the colors must stay separate, splitting the square into 4 parts if possible.
Amazon.com, Apple, McDonald's, Walmart, Fedex, UPS, Nike, Coca Cola, 3M, Target, Visa, Square, PayPal, Facebook, Uber, Lyft, Twitter, YouTube, Netflix, Samsung, Sony, Intel, Cisco, Oracle, IBM, SAP, Starbucks, Lululemon, Under Armour, NY Times, American Express, GAP, Best Buy, Costco, Exxon
I was thought quite the opposite for logos (re: colors): fewer colors is better, and the logo should be instantly recognizable in monochrome. It being something a layperson could draw reasonably well is also a good thing.
Edit: Did I just miss the sarcasm train here? It's very possible.