Brick Lane Bikes, summed up in one exchange

Surely by shaking the bottle you can tell how thick it is?

Bad advice from the shop but i if i gave you 2 bottles, both blacked out, one full of cola or your favourite soft drink, the other full of spunk, you'd know the difference.

the spunk wouldnt be bubbling when you drank it? not a mistake you'd make a second time I imagine..
*fyi, this is not a mistake I've made first either, but i've never been given a bottle of jizz