Ability to generate vocal sounds of a higher amplitude than a normal human.

Pros: Winning every fight with your girlfriend
Cons: A voice more annoying than Ray Romano

Ability to assault others with one or more varieties of toxins, with widely disparate effects.

Pros: Would always have a job in Russian politics
Cons: Cold winters

Ability to copy or absorb another's powers or skills

Pros: You could be like Mike
Cons: Lack of sex

Ability to stretch, deform, expand and contract one's body into any form they can imagine.

Pros: I think we all know what Jessica Alba saw in Mr. Fantastic
Cons: Getting tied in knots

Ability to cling to objects or surfaces by a variety of means

Pros: Could sneak into the house past curfew
Cons: It's pretty useless past the age of 18

Ability to expel various forms of energy from the body

Pros: Can make impressive laser shows
Cons: Misfires can do a lot of damage

Ability to see, smell, taste, feel and/or hear more than a normal human.

Pros: Eaves drop on who's talking shit in the office
Cons: Porta potties

Ability to control or mentally affect the weather. This includes the ability to generate various natural phenomena (rain, tornadoes, lightning, etc.) or control the intensity of the weather.

Pros: No more rain delays
Cons: Being invited to every outdoor wedding and having to pay for a gift.