1.
Cough syrup used to be really hardcore.
2.
Owls have really long legs.
4.
People have always been complaining about new technology.
5.
Russian cursive is worse than your cursive.
7.
When you blend idioms it's (informally) known as a malaphor.
14.
Caterpillars basically turn into goo when becoming a butterfly.
15.
The Trojan horse wasn't a gift for the Trojans.