"This will only take a second..."
Words that make me run screaming in the knowledge it will devour all your free time, energy, sanity, & migraine meds in the process.
Boss' that hand you a laptop last thing on Friday claiming it won't take long, except it ends up destroying your life as each fix triggers another fix because the previous one broke something.
Customers that walk in as you're trying to lock up & hand over their desktop with a cry of "Fix it p-p-p-PUHLEEEZE!"
You do all the hardware steps to make sure that's not the cause & then go to fire it up to check software.
Only to heave a huge sigh of relief that you didn't connect it to your network as you watch signs of every known virus, malware, scumware, & 128 different versions of AOL cascading through the damned thing as it powers up.
The boot to an anti virus scan CD & scrub of the bastard requires a day & a half after all the reboots.
You finally get it cleaned & now the fekkin thing won't boot because critical files have just been nuked.
Grab a copy of the OS disk, reboot to repair mode, & have that eat up another half a day or more just fixing all the broken/nuked files.
It finally boots on its own, you get to the desktop, only to find the arsehole is the kind that stores *everything* on the desktop & you can't find the mouse pointer through all the clutter.
You start creating folders into which you can group like items, clean off the desktop until you can find the mouse again, & *NOW* you can finally see the problem that might be the reason the fool brought it in for in the first place.
Namely someone had installed an RDP client, tried to "fix" their computer, & left a ransome note on the desktop with instructions on how to forward the demand money.
But why didn't the computer stay locked up & refuse to let you in at all?
You can thank all the crap on the system that made it impossible for the computer to have enough computational horsepower left over to complete the encryption process.
You delete the RDP client, restore to a previous good state, and jump through all the hoops to get the system working properly...
Only to have the customer ask in confusion "What have you done? All I wanted was for you to figure out why solitare wasn't working! Put it back! WAAAAAHHHH!"
*Deep breath, must. restrain. fists. of. death., relaaaax...*
And you can't refuse to do support for said person because it's your Mum and "I brought you into this world & I can take your ass back out."
*HeadDesk*