YT for the ones I could find, NBC for the others.
"I'm a twifter":
"Get it momma":
"Someone has forcibly inserted silverware into my hairless chest":
"Careful guys, they're gerbils":
"More like Zac what the Ef is wrong with you":
"If you're sad at night, and you sing in your bed...":
"Was that your mother?":
"I am your mother":
"Whack on, whack off":
caps by catherish312
ETA: ONTD seems to love him (and think he's gay all of the sudden again, but that's neither her nor there).
Also guys from here:
Zac Efron hosted “Saturday Night Live,” and it wasn’t awful. It also wasn’t great. The best skit featuring Efron was the post-“High School Musical” bit in the video above. Troy Bolton returned to high school after a year in college—disillusioned that not everyone in the world sings their feelings.
Efron wasn’t the problem. He was a pro in every skit he did—as the German exchange student tattling on Gilly and Kathy Lee Gifford’s singing son, Cody. The writers just didn’t put him in any amazing skits. I think they missed some great opportunities.
1, 2, pics