What's the stupidest thing you've had a player during a campaign...

What's the stupidest thing you've had a player during a campaign? During my last session I had the players invade a thri-kreen encampment and while they were planning out the details of it one of the players complained that their incredibly basic invasion plan was too detailed for how smart the characters were and added, this is a direct quote "How do we know the thri-kreen aren't going extinct on their own?"

My current group woke up a vampire assuming he could be convinced to join their crew.

Players find a stone chest. Beat around the bush when they actually want to open it. One finally opens it.

- "What's in it?"
- "Green Slime"
- "I stick my hand in it!" :D
- "Alright, you're gobbled up and are taking continuous damage, half of the damage it takes goes to you." (He played a wizard.)

He threw a temper tantrum, got saved and felt sorry for himself without thanking anyone else.

>PC1 sees a weapon called a 'micro-nuke launcher' in the rulebook. Decides that he wants it. He doesn't have enough money.
>PC2 gives him money to help buy it.
>We meet BBEG, who thinks that the PCs are his allies.
>PCs decide that BBEG must be stopped.
>PC2 runs off to warn BBEG about us before we have made our plans.
>Remaining PCs agree that our survival is secondary to stopping BBEG.
>BBEG gives PC2 a large number of mooks to try and stop us.
>Mooks appear. All standing in one group with PC2 in the middle.
>PC1 fires micro-nuke launcher at PC2.
>PC2 and all the mooks die.
>Two more PCs, including one that PC2 hated for most of the campaign, die because they chose to stay within the blast radius to make sure that BBEG's anti-matter reactor loses containment.

What the fuck does this complaint even mean?

He didn't see the point in going to kill the thri-kreen because of the off chance that they all died of natural causes.

Seems pretty simple. What evidence do we have that we can't just wait for the thri-kreen to all die off naturally?

while in the rectory of a powerful priest, barbarian decides to make a show of force in preparation to rob him. so he bisects the altar boy

Autismus Maximus (the player in question not the posters)

D&D, WoD/CoD, or other?
If it's World of Darkness, and at least one of your players is a vamp, for shame for not taking a perfect opportunity for diablerie.