English 12

 LIMERICKS!

Anapestic / Dactylic trimeter (lines 1, 2, and 5) (lax, lax, tense) - COMPREHEND

Anapestic / Dactylic dimeter (lines 3 and 4) (tense, lax lax) - ELEPHANT

The first line introduces the character. The 2nd lines characterizes him or her. Line 3 and 4 set up the punch line, and line 5 delivers the humour. Lines 3 and 4 are indented.

Example:

There was an odd fellow named Gus,
When travelling he made such a fuss.
    He was banned from the train,
    Not allowed on a plane,
And now travels only by bus.