"Just for Fun" exercises are spread throughout the workbooks. The following links lead to the various collections of jokes in the Master Books.

KISS Level 1.1. Identifying Subjects and Finite Verbs - Ex.9 

KISS Level 1.3. Identifying Complements (PA, PN, IO, DO) - Ex. 13

KISS Level 1.5 - Ex. 3 "Mama Skunk" 

KISS Level 2.1.6 - Distinguishing Finite Verbs from Verbals - Ex. 7

KISS Level 5.4 - Appositives - Ex. 11

KISS Level 4 - Verbals (Gerunds, Gerundives, & Infinitives) - Mixed Ex. 8

KISS Level 4 - Verbals (Gerunds, Gerundives, & Infinitives) - Gerundives Ex. 10

Level 6.7 Mixed Review & Additional Passages for Analysis ("Just for Fun" Section)