7h15 15 74lk1n9 l337.....17'5 wh3n y0u 5w17ch l3773r5 f0r num83r5....I 83c0m35 1, E 83c0m35 3, A 83c0m35 4, S 83c0m35 5, B 83c0m35 8, G(g) 83c0m35 9 4nd o 83c0m35 0.....50m3 p30pl3 u53 | 1n5734d 0f i......
(this is talking leet.....it's when you switch letters for numbers....I becomes 1, E becomes 3, A becomes 4, S becomes 5, B becomes 8, G(g) becomes 9 and o becomes 0.....some people use | instead of i.....)
hehehe

here's a mirc alias that'll make j00 fukk1n l337 1n n0 71m3:
/hax {
%Weird.font = *1
set %Weird.font $replace(%Weird.font,a,4)
set %Weird.font $replace(%Weird.font,b,8)
set %Weird.font $replace(%Weird.font,e,3)
set %Weird.font $replace(%Weird.font,g,9)
set %Weird.font $replace(%Weird.font,i,1)
set %Weird.font $replace(%Weird.font,o,0)
set %Weird.font $replace(%Weird.font,s,5)
set %Weird.font $replace(%Weird.font,t,7)
say %Weird.font
unset %Weird.font
}
type /hax blah blah, and the outcome will be 8l4h 8l4h.