The Gap Theory

In his new 'non-fiction' blog (a strange tag in an illusory world where everything is fictional anyway), my small brother (Chinnathambi) writes about his Law of the Loo. I quote:

When "n" urinals are aligned sequentially (n>5), the cleanest ones will lie between the 70th and the 80th percentile.

His reasoning is as follows: people rush to the nearest empty urinal, fueled by internal pressures and lack of sufficient thought being given to the process, which makes the first few urinals dirty. Then there are 'mamas' (remember Johnny Bravo: "Hey there, pretty mama!") who pick the last few, assuming no one takes the trouble of going that far. So, it leaves the cubicles in the 70-80th percentile extremely clean.

He has, unfortunately, due to lack of keen powers of observation, ignored the Gap Theory of Urinal Usage. When "n" urinals are aligned sequentially, if L_n is occupied by a user, the next loo user will only occupy L_n+2. L_n+1 is left unoccupied on account of lack of knowledge of L_n's user's orientation, Freud's theory of member envy and a prevailing requirement of freedom of expression.

The Gap Theory implies that when two of the aforementioned mamas are in the loo at the same time, or more than 40% of the urinals are occupied, the 70th to 80th percentile will get filled. Suitable modifications in his theory are therefore to be made.
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Oh, before someone accuses me of intellectual dishonesty, I shall clarify that I didn't come up with the Gap Theory. It was only valuable, ancient, secret knowledge passed on for generations at Cauvery Hostel.