And why were you acting so weird at the party?

She was acting weird, and it made him more uneasy than ever.

I saw him once before, and never forgot it because he was acting so weird.

"I didn't go with him because he was acting weird."

He's older than the others and he acts really weird.

Not that you don't always act somewhat weird, but I can usually brush it off.

"Kind of unfair for you to come up here, act weird, go away, and not answer questions about it."

Ever since you got here you've been acting so weird.

"You're getting paid to go drink for free and act weird."

"I was just going to say he's been acting a little weird."