class something{
    something(){...}
    ...
}
main(){
    something s; //this creates variable of type something (the call to the constructor is implicit)
    something(); //this is like calling a function, which returns object of type something 
                 //(or you can think of anonymous object - it exist, you just don't know how is it called)
    something t=something(); //you can either store it in variable of appropriate type
    something().Run(); //or call some of its methods (but in this case you didn't save
                       //the reference to the variable anywhere so you have no way to access it later)
}