They get caught in conveyor systems at recycling facilities. Just spin them off into a neighbor's lawn. they will look at the goofy titles and figure they came from someone else. Don't worry, Dirty Dancing and Pretty Woman will not be missed.
Get some Plastic Glue, put a CD on the table, put plastic glue on CD put next CD on top of original CD, ...keep doing that with the rest of CDs. Let Dry, for 24 HRS then all CDs have become a solid stack of Plastic that will go up the conveyor belt or into machines that shred it if that's what they do LOL