Pennies are useful for something after all...
Remember back in 1999 when you were just shedding your virginity to over-clocking? Remember the 80 bucks you spent on gizmo's and do-dads for your CPU and Video card to keep them cool? Well you could have spent 20 cents (very literally) on this retro-fitted video card heat-sink upgrade made out of pennies. "5 more and he'd increase his heat transfer by a quarter." See what dono1 did there?
Oh, wait. More?