Because I can. I think.

[slowfox]

pɹᴉǝʍ ɐpuᴉʞ sᴉ sᴉɥʇ

Comments

[aome]

Or Chinese readers. (China was always shown to be upside down in cartoons, as characters dug "through the center of the earth to the other side"). :P

How did you do it, anyway?

[slowfox]

By substituting HTML code for certain letters, based upon the information given at this Unicode charmap site. Note that it'll only work with browsers that support Unicode...

a	ɐ
b	p
d	q
e	ɘ
f	ⅎ
g	⅁
h	ɥ
i	ᴉ
k	ʞ
l	|
m	ɯ
n	u
o	o
p	d
q	b
r	ɹ
s	s
t	ʇ
u	n
v	ʌ
w	ʍ
x	x
y	ʎ
z	z
[space]	 

So, you take each letter, look it up in the left hand column and replace it with the text from the right hand column.

Obviously, you have to right-left your character sequence in the first place:
This is kinda weird
-> driew adnika si siht
-> qɹᴉɘʍ...
-> qɹᴉɘʍ ...

[slowfox]

The correct mapping for e is, in fact ǝ