Yoo Jae Suk displayed another side of himself in a recent episode of Infinity Challenge while helping Gil (Gary's other half in the duo LeeSsang) and the other IC members in this particular challenge. This also marks the first time viewers have seen him get quite angry, actually yelling at Gil out of frustration. The part starts around the 2:16 mark, but the whole clip is a must watch.
Quote
Dialogue during that part:
Gil:This won't work X2
JS:No it will work
JS:Hey!
Gil:You will fall down as well
JS:I told you i won't fall down, Hurry up and grab on!
....
Gil:You will fall down as well
JS:Aiee! I told you to Hurry up and go up!!
JS:Why are you soo distrusting of people!
Gil:It's not that i can't trust ...
JS:Hurry up and go!
That's why YJS is awesome. He slid all the way back down to go back up and help him.
As an aside, if the challenges were as picturesque and impressive as that on RM, I'd find the teamwork events more enjoyable. Sucking bananas through straws and jumping rope...not so much.