Stupidity: Chazz returns two cards to his deck and redraws another two cards using Magical Mallet. Alexis appears to recognise the two cards (Armed Dragon LV10 and White Vale) calling them "Two very powerful cards." Chazz then summons Armed Dragon LV10 and equips it with White Vale. Alexis attempts to activate a trap, but is surprised to find out she can't, to which Chazz replies the White Vale protects his Armed Dragon, but if she already recognised the card, then she should be aware of this. (00:17:35 - 00:18:30)
Homecoming Duel: Part 2 - S2-E16
Stupidity: Jaden uses the power of contact fusion to fuse Elemental Hero Neos and Neo-Spacian Flare Scarab to summon Elemental Hero Flare Neos without Polymerization. Aster shouts "That's against the rules", but in the previous episode, he saw Jaden summon Elemental Hero Aqua Neos in the exact same way, so he should be aware of this. Or at the very least, this shouldn't be a surprise to him. (00:15:05)
Stupidity: Wheeler gives Jaden a bunch of bananas and then eats two of them. Once he has finished eating them, he walks away and leaves the remaining bananas on the ground. At this point, Jaden is extremely hungry, having not eaten in days and has no idea how long it will take to get Back to Duel Academy, but he leaves behind the only available food to eat. (00:20:15)
Stupidity: When Sartorius first introduces himself to Chazz, he says, "You have a gift, Mr Princeton", to which Chazz asks "How do you know my name" in complete surprise. Even if Chazz is unaware of Sartorius' powers at this point, the Princeton family are very famous and wealthy, and his duel with Jaden was even broadcast live, so it wouldn't be unreasonable for someone to know who he is. (00:07:20)
Tough Love - S2-E43
Stupidity: When Syrus beats the Obelisk Blue student, the student throws him his GX medal. When this happens, the two are standing on rocks in between the ocean, and could have risked the GX medal falling into the ocean when it was thrown. It would have just been easier for him to hand Syrus the medal personally. (00:00:32)
