Here are my favorite movies in this genre for each letter of the alphabet:

A – Airplane! (1980)

B – Blazing Saddles (1974)

C – Clue (1985)

D – Dumb & Dumber (1994)

E – Elf (2003)

F – Ferris Bueller’s Day Off (1986)

G – Groundhog Day (1993)

H – Happy Gilmore (1996)

I – The Impostors (1998)

J – The Jerk (1979)

K – Kangaroo Jack (2003)

L – Life of Brian (1979)

M – Monty Python and the Holy Grail (1975)

N – The Naked Gun (1988)

O – Office Space (1999)

P – The Party (1968)

Q – The Quiet Man (1952)

R – Robin Hood: Men in Tights (1993)

S – Shaun of the Dead (2004)

T – Three Amigos (1986)

U – Uncle Buck (1989)

V – Van Wilder (2002)

W – The Waterboy (1998)

X – RoXanne (1987) (not many movies starting with X)

Y – Young Frankenstein (1974)

Z – The Zany Adventures of Robin Hood (1984)