Hmmm...lets see what I can think of ^_^
drillshine to upsmash with Fox is pretty awesome. Bonus points if you drillshine infinite for a while before hand. Even more bonus points if it's 0-death.
Shinespiking a Yoshi...WITH FALCO xD (Yes, I've done this before. I have the scars to prove it).
Shieldbreaking a jiggs in any way (usualy Falco pillar or full charged Marth neutralB after a missed rest).
Offstage Falcon Punch/Warlock Punch is always hilarious.
Dragging down space animals to their deaths with Peach's parasol.
Gannon dair while opponent is standing on the stage. I'll always brag about how "they suck so much that I killed them off the top...with an attack that sends them down!"
Kirbycide. Whoever dosn't enjoy doing this is inhuman.
Kirby's dair. That's my favorite meteor ever.
Any of Ness' edgeguards (especially repeated tailwhips after an fthrow on a space animal at 0%. I have bruises from the last time I did this)
Falco Phantasm into someone hanging on the ledge (for those who don't know, this meteors the guy hanging on the ledge, and sweetspots you at the same time).
fair/bair to spike with Marth.
There are endless possibilities