Many things make me laugh. I love physical comedy when the comedians are female (Lucille Ball, Ellen DeGeneres from her show "Ellen", "Laverne & Shirley"), I love old, old comedies ala 1920s/30s (Charlie Chaplin, Laurel & Hardy, occasionally the Three Stooges), I like screwball comedies (especially if put in a modern(ish) format: "What's Up, Doc", "Foul Play"), I love British humor/dry/sarcastic humor if it's not harmful or hurtful to another person, I like watching animals react to strange things, funny sketch humor, and I love humor that makes me think (Carlin, Pryor, etc).
Pretty much I'll enjoy anything that isn't distasteful or sick humor, or gross-out humor, or adult-themed humor...but even those things have their place (I love Monty Python and fairly dark webcomics, and puns of all varieties are well-appreciated).