the most crowded area you have ever scene?  

Outdoor rock concerts in the 1980's, where there were a number of bands playing, so there were a lot of different people that came to see the different bands.

I cannot remember anything right now but I think I always see a big crowd in theme parks like Canada's wonderland on a weekend on summer. They have very long line ups in different rides. Also I saw a lot of people in the Wasaga beach here on beach festival last summer.

i guess mine would be a concert or a mosh pit at a concert i had gone to when i was a teen

I seldom go for any concert or gigs, but i do for for countdown parties.. lol =D Be it christmas or new year's eve countdown party, i will be part of it because once we are out in the city area, everywhere is very crowded, with everybody waiting for the actual countdown to start.. lol =D

And singapore itself is small, so imagine that half or more than half of singapore's population gathering there for the countdown, it's so crowded that one can hardly move.. lol