允许

允 = 儿 + 厶 : Sun Wukong (儿) has a runny nose (mnemonic symbol for 允) and is constantly blowing his nose in the encampment ((e)n3). Yu the Great (yu) is very annoyed and tells him that it is not allowed (允) to blow one's nose in the encampment. Instead she hands him a fake nose (厶) with which he is to hide his real nose.

许 = 午 + 讠 : Xu Xian just loves having lunch in the space station. In fact he loves it so much that he calls mission control to get permission to praise it on an advertising column. After he got the permission, he smears his lunch all over the advertising column.