you ignore them for months on end, then return one day and find yourself listening to nothing else for an entire week. doing this right now with OK Computer. i always forget that the album is more than just Paranoid Android and Let Down, and that it's all quality.
i also do this with the following bands:
Rage Against The Machine
System of a Down
actually i haven't listened to SOAD in a while, i might put Mezmerize on when OK Computer is done.