The first person writes a famous person that begins with A, then someone else does B, and so on. And if you can't think of a famous person for a letter, like for X and Y, you can skip over it.
Don't sweat it... I was just poking fun at ya' ... and it could have been a "toughie" to dredge up a fameous "H-I-J" .... depending on the distractions or conditions over at your end. Sometimes "I" get distracted and simply miss a step and get CAUGHT doing the same thing! ... At any rate, following "M" comes....