Doing a search for conversion factors, that I put into a spreadsheet to make my life a little easier, I came across the following website. Has a heap of very interesting and useful conversion factors contained within it.
Have a close read of it....there are some interesting things in there. I found the following, and I'm sure there are more:
1 bananosecond = the time it takes between slipping on a peel and hitting the ground
1 billigram = the weight an evangelist carries with God
1 demijohn = 0.5 lavatories
1 fig Newton = 1 kilogram of falling figs.
1 hoarsepower = the basic unit of laryngitis
1 IV league = 3 miles of intravenous tubing at Yale University Hospital
1 kilohurts = 1000 aches and pains
2 kilomocking birds = 2000 mocking birds
1 lite year = 365 days on low calorie beer
1 literhosen = 1000 cubic centimetres of wet socks
1 knot furlong = the time it takes to sail 220 yards at 1 nautical mile per hour.
1 microfiche = 1 millionth of a fish
1 microscope = 1 millionth of a mouthwash
1 monologue = 5 dialogues
1 paradigm = 4 nickels
1 paradise = 2 snake eyes
1 paradox = 2 wharves
1 pentacost = 5 holocausts
1 rod serling = 25 links to the Twilight Zone
1 semicolon = half a large intestine
1 straight line = the shortest distance between two jokes
1 won ton = 1000kg of Chinese soup (short)