This isn't a joke that came from a dad or anything but I hope it's worthy!
My father started waiting in 1979 and took one of his first jobs at this extremely fancy and expensive restaurant. The type of place that the waiters wore tuxedos and whatnot. Anyways my dad worked with this guy named Froggy (nickname of course) whom my dad still praises to this day that he's one of the best waiters he's ever worked with.
Anyways, one night it's extremely busy and both my father and Froggy were rushing around trying to keep up. Well Froggy had this table with about 5-7 people all who looked like they wore expensive clothing, ordered the best food and so on. Well one of the guys ordered a baked potato as a side and Froggy proceeds with typical waiter stuff as asks if he wanted sour cream with his baked potato. The man says yes so Froggy scoops the cream and attempts to place it on the potato. Well... as he was moving to place it on, the cream slipped off and right onto this guys extremely expensive sweater... Completely in shock, the customer turns to Froggy and without missing a beat, Froggy slowly turns his head in a comical fashion towards the ceiling and proclaims "Those damn pigeons!"
Needless to say every single person in that table were crying with laughter, including my father one table over who observed the whole ordeal. Froggy said he'd pay for the dry cleaning and the customer said not to worry about it because it was the most hilarious thing he's seen in ages.