Mardi Gras-a carnival held in some countries on Shrove Tuesday (the last day before Lent) but especially in New Orleans.
Bottleneck effect is when there's something that either kills the majority of the population or just prevents it from reproducing. This creates genetic drift because the likelihood of gene prominence changing is much higher in a small population. The Founder Effect is a type of Bottleneck effect. It is when a small amount of individuals starts a population usually due to migration.
Both population bottlenecks and founder events have similar effects: they reduce the amount of genetic diversity in a population. Some genes are eliminated from the population, while others that may originally have been rare now become common. The important similarity between founder events and population bottlenecks is their randomness.