The hand is usually tightly in place, preventing lip movement and muffling throat noises. The concept of a hand gag is usually based around a subject being caught completely off-guard, as a kidnappers or other criminal surprises them. The hand prevents the subject from making an instinctive gasp or scream. The hand gag is usually followed up by more serious gags or other forms of bondage. Hand gags are impractical for long-term scenarios, as the subject must be kept in continual contact with the applier.