array.m

#import <Foundation/Foundation.h>

int main() {
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    NSMutableArray *anArray = [NSMutableArray array];
    [anArray addObject:[NSString stringWithString:@"red"]];
    id anObject = [anArray objectAtIndex:0];
    [anArray removeObjectAtIndex:0];
    [anObject someMessage]; // crash !!!

    [pool release];
    return 0;
}