i Had one in 4th grade where that day i put together my 2 half-working-braincells and i put a like small case that was plastic on them that had a zipper on it and i dont know why but i got the great idea to put like 4 milk cartons in my lunch bag they where strawberry flavored so i think thats why and I dont know how but one of them exploded and milk was everywhere but the thing is i had my tamas in there (with the case on) so i only found out at the end of recess because the bag was wet so i opened it straight away i got the cases and opened then they only has milk residue so im grateful that it didnt get into the cases alot and they are ok!