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.
The term Bottleneck Effect is used when a population has been reduced at some point in time to a small number of individuals with a loss of genetic diversity as a result. The population size may return but the bottleneck effect will be seen in the loss of genetic variation.