Top Ender gets one over on Daddy

"Its my School Trip today Daddy!"enthused Top Ender
"No it isn't, its tomorrow" answered Daddy
"Mummy told me it was today!" insisted Top Ender
"Mummy told me it was tomorrow!" insisted Daddy
"Well lets bet then. If it is today you owe me... a doughnut!" offered Top Ender
"Hmm" mused Daddy as Top Ender grabbed his hand and started shaking it
"Well now we have shaken on it so you have to agree!" Top Ender said gleefully
"Okay Top Ender" said a confident Daddy

The school trip was today... Daddy is off buying a doughnut