So far I have come across 2 songs that sound oddly similar.
1: House of wolves and Peter Griffin's Rock Lobstar (Family guy)
When you play the song Rock Lobster played by Peter Griffin on Family guy and then sync it to like 10secs in to House of Wolves, these songs match up almost perfectly.
2. SCARECROW Song and VAGINA Song by the Bloodhound Gang
These song's are already similar in title... But when you listen to the guitars playing you notice an odd similarity. Now, in MCR's song they have a second guitar playing loudly over the one that sounds similar.