31.   He was acting like a lovelorn teenager.

32.   It was nauseating to see the two of them act like lovesick teenagers.

33.   He was acting like someone with a guilty conscience.

34.   He acts like an overgrown child.

35.   Try to act like a civilized human being!

36.   Stop acting like a buffoon.

37.   Her mother was always telling her to act like a lady.

38.   They were acting like a bunch of morons.

39.   He was acting like a complete berk.

40.   He was acting like a complete turkey.