Reminds me of one from my childhoodI always knew it (45 years ago) as:
How do you get four elephants in a little red mini?
Two in the front and two in the back.
How do you know an elephants been in the fridge?
A footprint in the butter.
How do you know 2 elephants have been in the fridge?
2 footprints in the butter.
How do you know 3 elephants have been in the fridge?
3 footprints in the butter.
How do you know 4 elephants have been in the fridge?
No, there's a little red mini parked outside.
How do you know whether elephants have been shagging in the garden?
the grass is flat and the bin liners are missing