OMG, who doesn't know that Harrisburg is the capital of Pennsylvania. GMAFB.
A few years ago I faltered and had one of those moments where I couldn't remember whether the capital of Alabama was Montgomery or Birmingham. Then my brother gave me an indispensable mnemonic device: "Just remember that Monty had a penis the size of Alabama."
Then the same thing happened with New Mexico--Albuquerque or Santa Fe? Remember that Santa had a penis the size of New Mexico. (And shape.)