$125 for a loose bulb and a bad outlet.

[Lilburner]

Y'all can have these lessons for free. I had to pay for them.

In some fixtures, you have to tighten an LED bulb uncomfortably hard, to a point that feels like you'd break an incandescent or CFL bulb. The "nubbin" on the end isn't as pronounced, and sometimes it's hard to make contact.

A GFCI outlet can protect other, non-GFCI outlets, even on the complete other end of the house, and the outlet in the master bath can disable the outlet in the guest bath.

[ProGeek]

Yep, those GFCI circuits can be fun. Especially if you don't know what receptacles are on what circuit. Sometimes there are 2 GFCI receptacles on the same circuit. That's when it gets fun. As for the bulb, with the power off, you can take a screwdriver and pry up the center plate in the socket a little, maybe an 1/8 to 1/4 of an inch.