Wow, I've just had the messiest burrito ever. It was from a deli called Steamrollers (because they "steam" the pita bread and then "roll" it up with stuff inside... hey, I don't make this stuff up). Instead of using ground beef, they use stewed beef slices. It tasted pretty good, but it was really messy, especially towards the end. I had a huge wad of kleenex wrapped around the bottom to keep the liquid from running down my arm.
I swear, beef juice and tomato mixed together causes nuclear explosions.