Just say "I don't mind!" and lend them a different pencil.
Have a smile and just say "I didn't like that pencil anyway!" And hand them another pencil.
Turn around and say "How dare you break my pencil! I liked that one." And take the broken one back.
Say "Sure! The more the merrier!"
Look at your other friends and say "Well, sure."
Say "Um no. We're too full."
Take it to the office and turn it in.
Throw it in the trash thinking no one will miss it.
Rip off its head and laugh evilly.