I grew up on the farm, so fleas or anything that crawls doesn't bother me much.
Gary and I had to go to my daughter's last night - there was a tarantula crawling on her driveway in the morning when she went out to take Abigail to school. Abigail ran in the house and got a bug keeper box and caught the tarantula. (yes, she loves bugs, she has a lizard in an aquarium in her room). My daughter took her to school and then called me to say she was nauseated because there was a tarantula sitting on her driveway and I told her she was a WUSS! Then Gary and I had to go over in the evening to take Abigail and the tarantula to the pasture so she could let it go because my daughter wouldn't put it in her car, even in the bug carrier!!! Turns out it wasn't even a big tarantula, it was probably a teenager! My daughter claims that a tarantula chased her in the garden when she was 6 years old. I think her memories are greatly exaggerated!
The only time I have had fleas in the house was when I had two indoor persian cats who never went outside. I guess we brought the fleas in on our pants and the cats got them and they got in the carpet (that we had at the time). We did have to have someone come out and put stuff on the carpet to get rid of the fleas. Now I keep beneficial nematods on the yard and no more fleas!