Special moves
One of the entertaining aspects of The Sims Online is the wide variety of interactions your Sim can gain.  Heres what you can do at each skill level:

Body
2: Jazz Dance

4: Flex Body

6: Break Dance

7: Back Flip

8: Bench Press

9: Pile Drive

Charisma
2: Vogue

4: Sexy Wiggle

6: Kiss Hand

7: Pop Star

8: Tango

9: Smoke From Ears

Cooking
2: Psych

4: Cabbage Patch

6: Sissy Fight

8: Why Me?

Creativity
2: Showing Tude

4: Rap

6: Give Gift

8: Serenade

9: Jitterbug

Logic
2: File Nails

4: Nyah Nyah

6: Latin Steps

8: Primal Scream

9: Evil Laugh

Mechanical
2: Wipe Brow

4: Eye Poke

6: Hand Puppet

8: Head Spin

9: Swallow Sword

Friendships
2-way friendship: Propose

1 incoming: Hi-5, Berate, TD Dance

2 incoming: Secret Handshake, Kiss Hello, No Way, Heebie Jeebies

3 incoming: Cheer Up, Stomp Foot, Tantrum

4 incoming: Backrub, Grovel, Groove

5 incoming: Flying Hug, Kiss My $&@, Startled Scream

6 incoming: Worship, Tickle Extreme, Scat

7 incoming: Dip Kiss, Crack Back, Click Heels

8 incoming: Sultry Dance, Aristo Kiss, Can Can

9 incoming: Hustle Dance, Freak Dance, Melt Down

With one Enemy
Rip Heart Out, Attack