I like the Home Alone movies too.
Others that I watch whenever they are broadcast are the ones starring both Doris Day and Rock Hudson. I'm also a fan of most of the Pink Panther movies, especially A Shot in the Dark (I know that the scenes with Cato are racist but they are still hilarious - sorry but they are, being a spoof of the fight between Marco and Shaw's "houseboy" Chunjin in the original Manchurian Candidate).
Some westerns make my list, especially The Hallelujah Trail, Cat Ballou and They Call Me Trinity. The last mentioned has not been broadcast in Britain for many years, as far as I know. Perhaps TalkingPictures TV will get around to it.
Another one right up there is Carry On Up The Khyber (which is, for the benefit of members unfamiliar with English culture, rhyming slang for "ass" or "arse" as the English pronounce it). The scene with the "malfunctioniing" Maxim Gun reminds me of whenever I feel that God has it in for me, (They call it a Maxim Gun but it is more like a Gatling Gun - Pedantic Mary.) I count Kelly's Heroes as a great comedy too, although "real" war interrupts it from time to time.
Billion Dollar Brain, starring Michael Caine as the downtrodden agent treated better by the Soviets than by his British employers, is the only spoof among the Harry Palmer films but the final scene may be the funniest in any movie.