i know how you feel...my brother would spit his gum in to my guinea pigs cage! ofcourse i was grounded because i punched him and "accidently" knocked the wind out of him..... and he would throw all kinds of stupid stuuf in there (ie: popsickle sticks, candy wrappers, trash pizza crusts(which they enjoyed) and socks (which got peed on ) and any other cra he wanted to get rid of) of course i had no way of proving it was him so my mom never got him in trouble,