Neighbor 2: That is not a dog. That's a fucking RAT!
Neighbor 1: It's called a chihuahua, dumbass.
Neighbor 2: Oh....I knew that.
Neighbor 1: Yeah right.
Shark Mode: Go on a evil rampage and attack human hands
Spider Mode: When they jump up and stand on their back legs and fight something.
Dumbo Mode: When they jump so high it seems they are flying with their oversized ears.
Different Chihuahuas vary.