This movie nails both the comedy and the sci-fi halves of its script, and provides a shining beacon in the silly time travel sub-genre, as well as the pub crawl sub-genre. It’s a self-contained knock-out that neither overstays its welcome nor overplays its hand. This film is a solidly good time, no two ways around it.
Closest comparison: It’s like Bill & Ted’s Excellent Adventure by way of The World’s End.
Setting: Adventure
Plot: Time Travel
Tone: Comedy