I worked for a guy we didn’t like much who often wore a Seimans hat.
A friend used to work for Cummins. Now he works for Cummins-Onan. Which I guess is like Cummins, but faster.
Assawoman, Virginia. I learned about it because its zip code is one digit different than a zip in Alexandria.
The (recently deceased) Dick Trickle.
OUT!
Tesla Coils.
Say it five times fast 
“I swear BY MY BALLS that it really happened!” This is the actual origin of the words “testify” and “testimony”.
“He was a pedagogue, who practiced philately with young boys.”
Titicaca
Cucamonga
Ball State
Uruguay
Puyallup
Foggy Bottom
Eureka
French Lick
Semi-stiff boner knife
A santa got sacked for the joke
"How do you know Santa has been in your garden shed ? "
"From the hose hose hose "
Rim
Fracking
Bogey
Coq au vin
No one has mentioned Caulk yet?
My first week in law school, a friend showed me a case she had found in one of the case reporters dealing with ‘Improperly Discharged Seamen.’
Great tits. Sometimes seen in pairs, even.
Sclerotium.
I work with it as an ingredient in skin care potions and it always makes me giggle.
It wouldn’t occur to me – I don’t pronounce it like “cock”. The “Harry Johnson” snickering is lost on me too since Harry <> hairy.
The Onion did a similar list once and my favorite was “titular archbishopric”.
Hunt always gets a laugh amongst me and my old work buddies, because one of the guys was asked, “Do you know Bob Hunt’s brother Mike?” and he kept repeating, “Mike Hunt? Do I know Mike Hunt? Really? I know Mike Hunt?” for about 5minutes straight till we couldn’t keep ourselves from laughing and then he clued in 
There’s a sheriff in a nearby county. Mike Hunt. Seriously. (Well, he finally either retired or got voted out. But up until a very few years ago.)
Well, damn!