If you are an audio or stage technician, then gaffing cables is part of the job.
There is a right and a wrong way to gaff down cables. If you do it correctly, then you safely prevent performers and musicians from tripping on stage. If you do it incorrectly, you could be creating a bigger problem than not taping the cable at all!
The DCSoundOp shows us the basics of using gaff tape to secure cables to a stage or floor in this video.