Yes it is very good luck. I know this because when i did this in class i managed to prove my mate wrong, as the luck was i stumbled on to this question on Answers.com and nothing bad happened :)
An upside down umbrella can symbolize bad luck or protection being lost. It is also sometimes associated with rain or storms.
Usually an upside down umbrella catching raindrops or tears is seen as a sign of compassion. In both Hinduism and Buddhism, umbrellas or parasols are a symbol of wisdom.
Jellyfish
In mathematics, an upside down A means "for all".
A upside down rainbow means cheese or tacos
Sound like a passion flower vine
Answer it
The Upside down T symbol indicates perpendicular lines.
pnworhd is an upside down pyramid. If you take pnworhd in script and turn in upside down you will get pyramid
up
IgLoo
BRITNEY SHAVED OFF HER HAIR, ATTACKED A PAPARAZZI WITH AN UMBRELLA, HER WHOLE LIFE IS UPSIDE DOWN.
Anokatoprosopus means upside-down face (i.e. some aliens or monsters have upside-down faces).