A House Rule
A magic-user gets a +1 to all rolls associated with the resolution of a spell, provided the player introduces the spell with a short, improvised, rhyming incantation.
The rhyme need not be especially clever. However, the spell backfires horribly if the player reuses a rhyme, or rhymes a word with itself.
At the DM's discretion, the bonus may be increased to +2 if the rhyme leaves the whole table cackling.