Many of these conversion factors were posted as recycled humor by Sylvia Wulf on alt.callahans.
1012 microphones = 1 megaphone
2000 mockingbirds = two kilomockingbirds
10 cards = 1 decacards
1/2 lavatory = 1 demijohn
1021 picolos = 109 los = 1 gigolo
1 millionth of a fish = 1 microfiche
453.6 graham crackers = 1 pound cake
1 trillion pins = 1 terrapin
10 rations = 1 decoration
10-6 peeks = 1 microscope
100 rations = 1 C-ration
10 millipedes = 1 centipede
1012 bulls = 1 terrabull
3 1/3 tridents = 1 decadent
2 monograms = 1 diagram
8 nickels = 2 paradigms
2 wharves = 1 paradox
1 millihelen = The amount of beauty required to launch a single ship
10-2 mentals = one centimental
10-1 mate = 1 decimate