yesterday, when I took the subway, the lady in the speakers, the subway MC if you will, told us the usual:
"Good day folks, no use cramming all of you into this particular train, there are more trains right behind us"
but then she went into the following explanation:
"there's something wrong with a train ahead of us, causing...causing this constipation in the subway system".
We were still crammed but now more merrily so. Constipation - it's a gas.