Do you believe mirrors can actually act as portals for spirits?

Many cultures and paranormal investigators claim that mirrors can trap energy or serve as gateways to the other side, or other dimensions, which is why people often cover them after a death or refuse to place them at the front of their doos, cause they consider it bad. Have you ever looked into a mirror in the dark and felt a sudden wave of unease, or do you think our minds just play tricks on us?

In general, what's your take about mirrors?