Tell them, "Sure! Can't wait!" Who knows? Maybe you will get over or differences and become friends.
Tell your parents, "It's not nice to refuse," and tell the person, "Umm....ok."
Tell the person, "Never! Who'd want to hang out with someone like YOU? Ha! Not me, that's for sure."
Tell them, "No thanks, I'd never want to. Ever!" But, as you walk away, you feel a little bit guilty.
Laugh and join in on the bullies fun. You can always get more friends.
Yell at the bully, and stand up for your friend. You don't tell an adult in fear that they will just yell at you.
Laugh with bully, but feel awkward and embarrassed.
Stand up for your friend, and then tell a trusted adult.
Say, "Thanks, but no thanks. I'd rather do this fairly."
Tell them, "No thanks! I can do this on my own."
Say, "Great!", and copy their answers word for word.
Tell them, "Ok, thanks." You copy from them, but have nightmares afterwords about it, and you feel guilty.
"Yup, they did it. If I were you, I would definitely punish them."
"They didn't do it."
"My friend would NEVER do that! EVER!"
"...I don't know....."
Scream, "I'm not your friend anymore!" so that the whole pool can hear, then run away.
Pretend you don't see them.
Ask them if you can hang out, too. You all have fun, and forget about how they betrayed you.
You ask them why they lied, and then have fun by yourself. After a wile, you join them and forgive your friends, and you enjoy the rest of your time at the pool.
Here's an interesting quiz for you.