You have an electron flying along in a particle accelerator. Its mass, it being a lepton, comes from the Higgs boson. Why can't we see this directly?
Not enough energy to realize the Higgs. Now, if this electron happens to smash into, oh, say a positron with enough center-of-mass energy, a real Higgs boson might be prized loose from the vacuum. This is exactly what we try to do at particle accelerators.