My group has been gaming for decades and years ago we came up with an obscure house rule when we game on Easter (we always play on sundays). If a PC dies on Easter sunday their PC is ressurected (for free). This only applies to the first PC death which is rare but does occur. Yesterday a PC narrowly avoided an assassins death attack. Saved by a protection from arrows spell.
This is not meant to be sacraligous but I wondered if any others had any similiar or obscure house rules.