This is what I've got in another forum...
Say "silk" ten times....
1. Silk
2. Silk
3. Silk
4. Silk
5. Silk
6. Silk
7. Silk
8. Silk
9. Silk
10. Silk
Think quick. Answer it quick. What do cows drink?
You'll probably think of milk

, but no, cows drink water

.