I have a bunch but here are two specific ones:

[Me] VS
Prior to fighting this Luigi as Ganondorf, I fought him as Wario and Dr. Mario. He was pretty tough when I was Wario but I managed to win that round. For the match where I was Dr. Mario, I caped his recovery and beat him in less than 30 seconds. I did not taunt at all in both of those matches.
For our third match I switch to Ganondorf while he just does nothing but spam fireballs and d-throw combos. I had almost no experience fighting these kind of Luigi's as Ganondorf at the time so of course he beats me while barely keeping his first stock. While I'm being star KO'd he does the "HOO-HAH-HE HEY-HOO" taunt three times. Because, you know, I TOTALLY taunted when I beat him in 30 seconds as Dr. Mario.

[Me] VS
A crappy Sonic that literally did nothing aside from spin dashes. I was about to KO him so for the last 2 minutes of the match he just runs away from me. I land a few hits on him in that time but not enough to KO so we go into sudden death. He lands a lucky hit on me and wins, then changes his name to "SnicRules!" or something like that. I just said "LOL" and left.
If I listed all of my salty matches that involved fighting against

's and

's, it would probably fill 20 pages.