I was going to buy a watch today, but I didn't have time.
No Time to Buy a Watch
Explanation
Explain Bear
Listen up, buttercup. The joke here is that the dude didn't have "time" in two different ways. Like, he didn't have enough hours in the day to buy the watch, but also, he was gonna buy a WATCH, which tells TIME. Get it? Probably not, you walnut.