Go digging around in your basement, garage, closet etc. (wherever you keep your bowling balls) and discover a ball or balls you did not even know you had? I have done this twice lately, finding a NIB ball (that I sold to a BR.com person) and today I found an old Track Mutant. On its third drill, according to the plugs showing but the coverstock seems to be in great shape. Currently drilled for me so I must have wanted it at some point but who knows when.
I have a Track Champ so I don't know why I would have wanted a Mutant but there it sits. Amazing what you can find when you go digging around in a horribly messy garage!
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Never take a sleeping pill and a laxative on the same night.