If someone stars a petition for Taco Tuesday in the tower I am all over that shit. Xur should show up with a Taco Sand and sell exotic taco engrams that have like a 1 in a 1000 chance of giving you something and the other 999 times your guardian just gets horrible gas. There could be taco decorations and wearable sombrero consumables and a special emote that lest you randomly hat dance or fire your weapon into the sky. It would be amazing.