Generally a virtual particle will pop into existence, do whatever it does, and then pop out before the universe catches it. For example: the gluon (pronounced “glue on”) is the virtual particle that holds the nucleus together. Virtual particles have to be inferred. But virtual particles can only be detected in terms of the effects they have on other particles (like holding an atom together). And even with the uncertainty principle the extra energy gets ironed out faster than you can blink.