At the Marine Corps Marathon (海軍陸戰隊全馬) this year, all you have to do is wear Brooks MCM 2008 apparel and you get the "special privilege" of using the Brooks VIP Porta Potty.
Benefits:
Flushing toilets
Partitioned Stalls
Climate Control
Fragrance Dispenser
Hot and cold water
Auto shut-off faucets
Oak vanity and mirror