As Ewa was going to St. Ives
（Periodic Table）

As Ewa was going to St. Ives
Etta met a man with seven wives,
Each wife had seven sacks,
each sack had seven cats,
Each cat had seven kits:
kits, cats, sacks and wives,
How many Chins were going to St. Ives ?

よくあるパターン、引っかかると笑われる。