Laughter - Human Equations

Got this from a Friend of mine...had me giggling.

Equation 1 

Human = eat + sleep + work + enjoy 
Donkey = eat + sleep 

Therefore: 
Human = Donkey + Work + enjoy 

Therefore: 
Human-enjoy = Donkey + Work 

In other words, 
A Human that doesn't know how to enjoy = Donkey that works. 

Equation 2 

Man = eat + sleep + earn money 
Donkey = eat + sleep 

Therefore: 
Man = Donkey + earn money 

Therefore: 
Man-earn money = Donkey 

In other words 
Man who doesn't earn money = Donkey 

Equation 3 

Woman= eat + sleep + spend 
Donkey = eat + sleep 

Therefore: 
Woman = Donkey + spend 
Woman - spend = Donkey 

In other words, 
Woman who doesn't spend = Donkey 

To Conclude: 

From Equation 2 and Equation 3 

Man who doesn't earn money = Woman who doesn't spend 

So Man earns money not to let woman become a donkey! 
And a woman spends not to let the man become a donkey! 

So, We have: 
Man + Woman = Donkey + earn money + Donkey + Spend money 

Therefore from postulates 1 and 2, we can conclude 

Man + Woman = 2 Donkeys that live happily together!