If you know someone just learning English (and especially if they are non-Europeans), have them read the following sentence:
He had a rough cough after he couldn't come through with the dough to pay for the bough in the trough.
Pronunciation guide for those who need help:
cough
[kof]
through
[throo]
rough
[ruhf]
dough
[doh]
bough
[bou]
trough
[trawf]
