I've played since 2004 and had countless stupid noob moments, but I'll give one dumb thing (or a series of dumb things) I did just a couple weeks ago. Proof that experience does not eliminate completely boneheaded play.
The scene: Dynamis-Beaucedine, out farming exp for some Relic+2 enhancement. On my way back from the looooong run getting the TEs near Fei Yin, I see an Orc NM. Me: "Hey, maybe I'll get a 100!", <fights Orc NM, completely forgetting that they use a charm move>, <gets charmed and wanders around following the Orc wasting like 5 minutes while it regens to full health>.
Then I realize I'm on PUP and my automaton can easily take the Orc and won't get charmed. OK, cool. I send my automaton at the NM and hang back... but not far enough back, because I get caught with Charmga move AGAIN. Waste another several minutes following an Orc.
Take 3. I send the automaton in, decide I REALLY need to give it room this time and just leave the puppet on the Orc while I run to my farming spot. Puppet will come find me eventually. I go waaaay across the zone toward the Nue tower and my last TE (the 20min one), and start farming on the fomor near that tower. I'm having a fine time farming for a good 10+ minutes with my WHM duo partner, ignoring the fact that my puppet is busy elsewhere.
As I'm getting into my farming rhythm, I see someing weird. "Hmmm, why are there Orcs up here? I thought there were just fomor in this area." Sudden realization dawns on me that OH MY GOD THERE'S A TRAIN OF 30 ORCS THAT MY PUPPET JUST LINKED AND BROUGHT BAC <dies as the Orc alliance descends on me>.
Yeah, I'm a 10 year veteran player who has played PUP since ToAU launch... /facepalm