In no particular order.
- Once a year, we stab challah with a key dozens of times.
- It's crucially important that the letter shin on the outside of a mezuzah scroll faces the correct direction.
- Some women, in an attempt to be modest, cover their hair with a wig (ie, different hair). This commonly looks better than their own hair.
- There's 18 and 72 minutes of wiggle room at the beginning and end of Shabbat.
- It's polite to ask someone else to bless the wine in case your own blessing isn't good enough.
- For some things, simply being Bar Mitzvah'ed isn't enough. You must be observant, but that's not really defined.
- It's true - everyone has their own rules for keeping kosher.
- Not all horseradish is created equal. Some is good enough for Passover, but not good enough for the seder plate.
- Not all matzah is created equal either.
- Speaking of matzah, there are guidelines for minimum amounts required to eat at seder. I freely (but quietly and politely) disregard these.
- Three rabbis can have four answers to the same question. Okay, I already knew that one.
- Not a rule, but Reform Jews and Orthodox Jews have equally wrong opinions of each other.
- A youth group has become the national standard for Grace after meals.
- Occasionally toilet paper needs to be pre-torn.
- Don't answer the door to talk to a neighbor between washing your hands and saying Ha'motzi because someone'll get stuck being silent for a while.
- After getting ritually cleaned, it's vitally important to take a shower to get actually cleaned. The same goes for dishes.
- If you un-kosher something by doing something cold, it doesn't need to be re-koshered.
- If you wear red (particularly if you are a woman), you cannot frame a picture of yourself and hang it in the living room. Word is still out on what if it is unframed or in a different room.
19. If you need to temporarily make a knife kosher, you can stab it in dirt 10 times. I swear, you can't make this stuff up.