The Narita Express成田エクスプレス Toilet..

..is bigger and nicer than the toilet in my apartment.

Actually, it's the EXPRESS Express - it only stops at Musashi-Kosugi武蔵小杉, Shinagawa品川 and Tokyo東京 once it leaves Yokohama横浜, but costs a bit more than the regular express (\4180) at \4380.
The next stop after Tokyo is Terminal 2.