I can't pick a favorite, but @Dwhatever 46:59 in 70 star is pretty good
This one's pretty good just for sheer surprise in JJ's voice https://www.speedrun.com/sms/run/mexj7j2z
the one where they rethink life and think to themself
"why did i just spend multiple hours running in a block game..."
My favourite reaction at the moment. The strat Guy does where he clips the edge of the ramp to get super low air is called a "King Alex" (named after King Alex) and it saves loads of time. It is a VERY hard trick, and for many years the WR has not even done a single one.
Guy just did 3 of them in one run. This was the fastest ever pace entering lap 3. Every single one of Guy's other 12 WRs here have been improvements of 1 decimal place, or less (e.g .2 -> .1). This was a cut of .5, something we may never see again. Oh and King Alex was in chat.
Mine has to be Dwhatever's 46:59. Either that, or nindiddeh's 1:13:49 on GCN Super Mario Sunshine.
This is not a full mode or full game speedrun, but this reaction for the then-World Record in Super Smash Bros. Melee (Link's Target Test) was really cool. It was exciting for the community at the time.