to drink a cup of tea, once finished fart in the cup. politely ask your girlfriend if they would like to have a drink( they are totally unaware of what you have just brewed for them!)
(gaz farts in2 finished cup of tea, emily is not aware)
"hey babe u want some tea?"
"yeh sure my little love muffin"
emily then drinks the brew and smells the fart
"oh my god did you just mug fart me?"