Potential Public Transport Promo Brings Sour to Our Stomachs

We're not really sure what's going on in this photo posted on Flickr by Kitanotenshi, but if it is what we think it is - a product sampler pasted to a public transport window - then WTF, man, who's really going to lick the side of a bus?

...And for the taste of fresh milk? They may as well have gone the extra mile and given us a disembodied udder to suck.