This was a story told to us by our chemistry master at school. A female
student wished to make some potassium hydroxide solution (aqueous) and
decided to throw a large lump of potassium into a bucket of water.
Her professor observed what she was about to do, out of the corner of
his eye and hurried towards her, and after confirming this was what she
was intending to do, asked her first to stir the water in the bucket
for five minutes before adding the potassium.
She was puzzled and ran after him to ask the purpose of this action.
‘It will give me time to get away’ said the professor