Obfuscatory

1. adj.

Definition: intended to conceal the truth by confusion

Example: the politician's obfuscatory speech

Sentence: My brother's obfuscatory excuse to the teacher about being late for class confused her so much he didn't get detention.

Notes: This word at first seems serious, but as you say it becomes funnier and funnier.  The word itself is obfuscatory and confusing!  It's the perfect word in a situation when you need it.

Gossamer

1.  adj.
Definition: light, delicate, or insubstantial
Example: a butterfly's wings
Sentence: The gossamer flower floated down from the air where the wind had blown it.
Notes:  I love this word because of the way it sounds.  It is a delicate word and is beautiful when used properly.  Its gentle sound gives away its meaning from the beginning, so it's easy to remember the meaning.