Then perhaps you missed the one two verses before that: "I tell you the truth, this generation will certainly not pass away until all these things have happened."
Perhaps even a little of: "I tell you the truth, some who are standing here will not taste death before they see the Son of Man coming in his kingdom." Matthew 16:28.
Or: "After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever." I Thessalonians 4:17.
"Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour." I John 2:18
"This is what I mean, brothers: the appointed time has grown very short. From now on, let those who have wives live as though they had none..." I Corinthians 7:29.
"They said to you, 'In the last times there will be scoffers who will follow their own ungodly desires.' These are the people who divide you, who follow mere natural instincts and do not have the Spirit." Jude 18-19.
I don't think Harold Camping was the first kook by a looong shot.