Generally, it is acceptable to burp, slurp while at the table. Some chargers use "negative pulse charging", also called "reflex charging" or "burp charging". This also makes it burp frequently from the resulting gas. Many other mammals, such as cows, dogs and sheep also burp. "Soup and Tart", entitled&colon; "Burp&colon; Soup and Tart Revisited". Cricoid pressure is often confused with the "BURP" (Backwards Upwards Rightwards Pressure) maneuver. Physostomes can "burp" out gas, though this complicates the process of re-submergence. Homer's special power is a giant burp, which can stun enemies. It was also referred to on "Harry Hill's TV Burp" twice. Both cricoid pressure and the BURP maneuver have the potential to worsen laryngoscopy. Zippy appeared twice in a 2008 episode of "Harry Hill's TV Burp". Therefore, engines must "burp" out air periodically in order to run for a long time. He appeared on Harry Hill's "TV Burp" parodying the character he played in "Casualty". He was also part of the writing team of "Harry Hill's TV Burp". Other notable television appearances include Off The Rails, Harry Hill's TV Burp and The Panel.