Your home is full of stir thinning liquids.
Tomato ketchup, honey, emulsion paint, toothpaste and mustard are all stir-thinning liquids. If you want to get ketchup out of its bottle you shake it up to stir it and this makes it thinner and runnier.
If a big pot of paint has been left a while it will become thick and you cannot get it out of the pot. If you want to get it out of the pot then you have to stir it up and this makes it runny again.
The ink in ball point pens is also stir-thinning. If you turn a biro up-side-down the ink will not flow out...so how come you can write with it?
Well, at the tip of the biro is a small steel ball which churns up the ink as you write (that's why it's called a 'ball point' pen). Since the ink is stir-thinning it becomes runny and flows out of the pen and onto your paper, but only when you roll the ball in the pen by writing with it...clever eh?