A famous one: Peter Piper picked a peck of pickled peppers, A peck of pickled peppers Peter Piper picked. If Peter Piper picked a peck of pickled peppers, where's the peck of pickled peppers Peter Piper picked?
also, this one (LeBronjames posted a variant a bit earlier): How much wood would a wood chuck chuck if a wood chuck could chuck wood? He would chuck, he would, as much as he could, if a wood chuck could chuck wood!
Zeter Zizzer zicked a zeck of zickled zezzers, a zeck of zickled zezzers Zeter Zizzer zicked. If Zeter Zizzer zicked a zeck of zickled zezzers, where are all the zezzers that Zeter Zizzer zicked? I got this of a little kid show. = )