On the fifth day of Christmas

On the fifth day of Christmas
My true love gave to me
Five golden rings, four calling birds
Three French hens, two turtle doves
And a partridge in a pear tree.

The Young Men's Christian Association (commonly known as YMCA or simply the Y) was founded on June 6, 1844 in London, England and opened its first American YMCA on Dec. 29, 1851 in Boston, Mass. It is one of the many organizations that espouses "Muscular Christianity." Today, YMCAs are open to all, regardless of religion, social class, age, or sex.

However, most people think of the YMCA as a deliciously silly 1978 song by the Village People:

It's fun to stay at the Y-M-C-A.
It's fun to stay at the Y-M-C-A.