R: How to extract a list from a dataframe?

Consider this simple example

> weird_df <- data_frame(col1 =c('hello', 'world', 'again'),
+                       col_weird = list(list(12,23), list(23,24), NA))
> 
> weird_df
# A tibble: 3 x 2
   col1  col_weird
  <chr>     <list>
1 hello <list [2]>
2 world <list [2]>
3 again  <lgl [1]>

I need to extract the values in the col_weird. How can I do that? I see how to do that in Python but not in R. Expected output is:

> good_df
# A tibble: 3 x 3
   col1   tic   toc
  <chr> <dbl> <dbl>
1 hello    12    23
2 world    23    24
3 again    NA    NA