Practicing on your league pair is not illegal to the ABC (or whoever it is this year.) However, individual leagues are allowed to prohibit the practice in their bylaws.
In the absence of being mentioned in the bylaws, I don't know if any centers attempt to prevent it just to keep bowlers from complaining.
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"Heres a Llama, Theres a Llama and another little Llama, Fuzzy Llama, Funny Llama, Llama Llama Duck. Llama Llama, cheesecake Llama Tablet, Brick, Potato Llama Llama Llama, Mushroom Llama, Llama Llama Duck. I was once a tree house, i lived in a cake, but i never saw the way the slayed the rake. I was only three years dead, But it told a tale, And now listen little child, to the safety Rail. Did you ever see a Llama, Kiss a Llama on the Llama? Llama Llama's, Taste of Llamas, Llama Llama Duck.
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http://www.albinoblacksheep.com/flash/llama.php
