Tickle my fancy

Brendan is big into tickles lately. The other night he was sitting on the bed with Jeremy asking to be tickled. "Tickle my belly." Jeremy obliged. "Tickle my toes." Jeremy obliged. "Tickle my elbow." Jeremy obliged. "Tickle my neck." Jeremy obliged. (this game goes on for what seems like hours.) "Tickle my chin." Jeremy obliged. "Tickle my booger." Huh? What? How does one tickle my booger? Needless to say, the game ended.