Lissandra and Yorick interation... the CLAW
When Lissandra uses her claw thingy while Yorick drops a ghoul on Lissandra the ghoul will land at the location of the claw NOT Lissandra. So even if she doesn't port to the claw the ghoul will still go there. Happened several times in one match up. Some of her other abilities seemed to have a similar interaction but I wasn't paying close enough attention to know which or how it happened.
edit: It seemed to me that this only happened if Liss used an ability at exactly the same time as Yorick.