Danger: Contents Under Pressure

Last night I made Oli a mocha and put it in a thermos to take with him to work. Sadly he didn't get to drink it because when he opened it it had a bit of a funk and was frothy. Today I went to clean it and couldn't open it. Not surprise because Oli likes to be sure everything is good and tight, gas caps, nuts, bolts, pickle jars, everything. Since he is significantly stronger than me I often can not open these things so I hand it to Dieter to open. Dieter is a nice strong manly man but he couldn't open it either. He tried hot water, cold water, hitting it, all the standard tricks, no go. Til finally after much grunting it opens with the noise of a depressurizing airlock and spews out a frothy brown foul smelling liquid that was allegedly once a mocha. Apparently containers under large amounts of pressure are difficult to open. Lucky for Dieter, he gets to sleep rather than spend the night scheming how to reprove his manhood.