A quiz that caught the class off-guard.
His sudden appearance at the office caught her completely off guard.
"Are you well?" he asked with a brusqueness that caught her off guard.
Make these plans ahead of time, so that you aren't caught off guard at the last minute.
Then the host caught her off guard when the conversation segued to the Psychic Tipster.
Jule smiled despite his unease, not about to be caught off guard by the creature.
The tone combined with the much coveted endearment of 'Dad' caught him totally off guard.