"Avatar" may be #2 (behind #1 "Titanic") in worldwide alltime gross but is only #78 when those grosses are adjusted for inflation.
Indeed, under "adjusted for inflation" totals, "Avatar" just squeeked by "Swiss Family Robinson", "Mrs. Doubtfire", and "House of Wax" in the last few days but is still behind "Smokey and the Bandit" (#63), "Blazing Saddles" (#47), and "Thunderball" (#26). Holding the all time #1 spot is, of course, "Gone with the Wind". http://boxofficemojo.com/alltime/adjusted.htm