I guess the mind of a human being is good at recognizing
patterns.. and hence "Javaranch" was a collection which was a registered pattern in your brain which led to it being noticed.
when you were scannin through the list the brain was matching the patterns against what it has registered as what may not be spam for you... but if you were not just scanning through the spam, instead were trying to search for a specific mail not related to javaranch, there was a higher probability of you missing the javaranch mail...