The Top Ten things the Thunderkittens do in their spare time. 

Special Mentions:   

Each other (think about it) (MST CROW1, Kkatman) 

Duct tape tMumm-Ra's Sarcaphagus shut.  (MC68040) 

Wilykat doing a "pantyraid" in the Tree Top Village.(silverpanther) 

Spaceboard Racing, as always. Or, when nostalgic for Thundera, Nude Spaceboard Racing. (Kkatman) 

Stick Snarf's tail in hot water when he's asleep. (BKingKat) 

Here is da Top Ten! 

10. Dress up like a bat and scare the hell out of Panthro. (MC68040) 
9. Replace Lion-O's lubricant with super glue and watch him and Cheetara try to get out of the "act" once they realize they are stuck together. (MC68040) 
8. Try to figure out why Tygra has so much vasaline in his closet. (Mat0014) 
7. Replace Luna and Chilla's make up powder with itching powder. (MC68040) 
6. Hide flatulence-causing pellets in the Mutants' food, then secretly watch as the fun blasts loose.(Demonprist) 
5. Wilykat sews Lion-O's underwear shut in revenge for that time Lion-O did to Wilykat's underwear. (see #2, "The Top Ten things that Lion-O does in his spare time".)(MC68040) 
4. Play chicken with the space boards against those poor defenseless 
Berbils(MC68040) 
3. Welds the bathroom door shut at night and watch those poor ThunderCats in the 
morning, trying to hold it in while someone opens the door. (MC68040) 
2. Sneak off to the Black Pyramid & take snapshots of Mumm-Ra modeling his collection of teddies.   (BKingKat)     
1. Call the pshycic friends network and get their free Brazilian power crystal.  (Mat0014)