(n) A life cycle event in Jewish tradition. At 13 years of age, a young man must officially choose Judaism and enter a synagogue. To prepare, he studies Torah intensely under a Rabbi's supervision and leads a ceremony in which the young man presents and analyzes a Torah portion to prove his understanding. Many modern incarnations of this tradition are (unfortunately) focused more on hiring a DJ and getting presents (usually monetary, in increments of $18). There's often an unspoken competition between families to see who can throw the biggest, most outrageous party, and so the religious component is often an obligatory afterthought. Not exactly what G-d had in mind, I'm sure.