You are sitting at a restaurant with a hot date, trying to look all cool. You casually pick up the ketchup bottle to put some on your fries. It doesn't flow. You start with gently shaking the bottle but nothing happens. Eventually you are forced to smack the bottle repeatedly, all the while swearing at the ketchup bottle "Flow, darn you ketchup, flow!" Then you get a river of ketchup all over your plate. That's it, you've lost any chance of making points with that hottie.
Ketchup is a fixatropic fluid. This means it displays two viscosities. When it is motionless it is very thick, but when its moving it is thinner. That's why it is impossible to pour out just the right amount of ketchup - it is all or nothing!
This useless factoid is courtesy of First Lobster who is an 'instrument geek' - his words not mine, I just call him 'Honey'.
Now you are smarter than Wikipedia, which doesn't have an entry for fixatropic.
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