From this old thread:

I've lost a car tire, how about you?
1 pound = a Guinea Pig

1.5 pounds = a dozen Krispy Kreme glazed donuts

2 pounds = a rack of baby back ribs

3 pounds = an average human brain

4 pounds = an ostrich egg

5 pounds = a Chihuahua

6 pounds = a human’s skin

7.5 pounds = an average newborn

8 pounds = a human head

10 pounds= chemical additives American eats each year

11 pounds = an average housecat

12 pounds = a Bald Eagle

15 pounds = 10 dozen large eggs

16 pounds = a sperm whale’s brain

20 pounds = an automobile tire

23 pounds = pizza an average American eats in a year

24 pounds = a 3-gallon tub of super premium ice cream

25 pounds = an average 2 year old

30 pounds = cheese an average American eats in a year

33 pounds = a cinder block

36 pounds = a mid-size microwave

40 pounds = a 5-gal bottle of water or average human leg

44 pounds = an elephant’s heart

50 pounds = a small bale of hay

55 pounds = a 5000 BTU air conditioner

60 pounds = an elephant’s penis (yep, weights more than his heart!)

66 pounds = fats and oils an avg American eats in a year

70 pounds = an Irish Setter

77 pounds = a gold brick

80 pounds = the World’s Largest Ball of Tape

90 pounds = a newborn calf

100 pounds = a 2 month old horse

111 pounds = red meat an average American eats in a year

117 pounds = an average fashion model (and she’s 5’11”)

118 pounds = the complete Encyclopedia Britannica

120 pounds = amount of trash you throw away in a month

130 pounds = a newborn giraffe

138 pounds = potatoes an average American eats in a year

140 pounds = refined sugar an avg American eats in a year

144 pounds = an average adult woman (and she’s 5’4”)

150 pounds = the complete Oxford English Dictionary

187 pounds = an average adult man

200 pounds = 2 Bloodhounds

235 pounds = Arnold Schwarzenegger

300 pounds = an average football lineman

400 pounds = a Welsh pony